Methods and apparatus to gather and analyze electroencephalographic data

ABSTRACT

Example headsets and methods for gathering electroencephalographic signals are disclosed herein. An example headset includes an adjustment assembly including a first support to be disposed on a first side of a head of a person and a second support to be disposed on a second side of the head of the person. The example headset also includes an adjustor operatively coupled to the first support. Further, the example headset includes an electrode strip and a tension strap having a first end operatively coupled to the adjustor and a second end operatively coupled to the second support.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent arises from a continuation of U.S. application Ser. No. 14/293,557, titled “METHODS AND APPARATUS TO GATHER AND ANALYZE ELECTROENCEPHALOGRAPHIC DATA,” filed Jun. 2, 2014, which claims priority to U.S. Provisional Application No. 61/974,847, titled “METHODS AND APPARATUS TO GATHER AND ANALYZE ELECTROENCEPHALOGRAPHIC DATA,” and filed Apr. 3, 2014. U.S. application Ser. No. 14/293,557 and U.S. Provisional Application No. 61/974,847 are incorporated herein by reference in their entireties.

FIELD OF DISCLOSURE

This disclosure relates generally to neurological and physiological monitoring, and, more particularly, to methods and apparatus to gather and analyze electroencephalographic data.

BACKGROUND

Electroencephalography (EEG) involves measuring and recording electrical activity resulting from many neural processes associated with different portions of the brain. EEG data is typically measured using a plurality of electrodes placed on the scalp of a person to measure voltage fluctuations resulting from this electrical activity within the neurons of the brain.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a first side view of an example headset constructed in accordance with the teachings of this disclosure for gathering EEG signals and including an example electrode assembly and an example adjustment assembly.

FIG. 1B is a second side view of the example headset shown in FIG. 1A.

FIG. 1C is a right rear perspective view of the example headset shown in FIG. 1A.

FIG. 1D is a left rear perspective view of the example headset shown in FIG. 1A.

FIG. 1E is a front view of the example headset shown in FIG. 1A.

FIG. 2A is an enlarged view of an example electrode unit of the example electrode assembly of FIG. 1A showing example electrode pins in an extended position.

FIG. 2B is an enlarged view of the example electrode unit of FIG. 2A with the example electrode pins shown in a first retracted position.

FIG. 2C is an enlarged view of the example electrode unit of FIG. 2A with the example electrode pins shown in a second retracted position.

FIG. 3A is a front left perspective view of another example headset constructed in accordance with the teachings of this disclosure and including an example electrode assembly for gathering EEG signals.

FIG. 3B is a side view of the example headset of FIG. 3A.

FIG. 3C is a left rear perspective view of the example headset of FIG. 3A.

FIG. 4 is a bottom view of an example implementation of the example electrode assembly of the example headset shown in FIGS. 3A-3C.

FIG. 5A is an enlarged view of an example flexible printed circuit board shown in the assembly of an example electrode strip of the example electrode assembly of FIG. 3A.

FIG. 5B is an enlarged view of the example electrode strip of FIG. 5A.

FIG. 5C is an enlarged view of the example electrode strip of FIG. 5B and shown with example electrodes.

FIG. 5D is an enlarged view of the example electrode strip of FIG. 5B and shown with example wire guides.

FIG. 6 is an exploded view of another example implementation of the example electrode strip of the electrode assembly of FIGS. 3A-3C.

FIG. 7A is a perspective view of an example implementation of an electrode capable of use in the example of FIGS. 2A-2C and/or the example of FIGS. 5A-5D.

FIG. 7B is a cross-sectional view of a first example implementation of the example electrode of FIG. 7A.

FIG. 7C is a cross-sectional view of a second example implementation of the example electrode of FIG. 7A.

FIG. 8A is a perspective view of an example processing unit for use with the example headsets shown in FIGS. 1A and 3A.

FIG. 8B is an enlarged view of an example connection hub of the example processing unit of FIG. 8A.

FIG. 9A is a perspective view of the example implementation of the example electrode assembly of FIG. 1A and having an example connection port.

FIG. 9B is an enlarged view of the example connection port of FIG. 9A.

FIG. 9C is a perspective view of an example communication link of the example electrode assembly shown in FIG. 9A.

FIG. 10 A is an exploded view of an example implementation of the example connection port of the example headset shown in FIG. 1A.

FIG. 10B is a perspective view of the example connection port shown in FIG. 10A.

FIG. 11A is a perspective view of the example processing unit of FIG. 8A coupled to the example electrode assembly of FIG. 1A.

FIG. 11B is a cross-sectional view of the example processing unit of FIG. 8A coupled to the example electrode assembly in FIG. 11A taken along the line A-A of FIG. 11A.

FIG. 11C is another cross-sectional view of the example processing unit of FIG. 8A coupled to the example electrode assembly in FIG. 11A taken along the line B-B of FIG. 11A.

FIG. 12 is a block diagram of an example circuit from the headset in FIG. 1A.

FIG. 13 is a flowchart representation of example instructions, at least some of which are machine readable, for using the example headset of FIG. 1A.

FIG. 14 is a flowchart representation of example machine readable instructions for analyzing EEG data gathered with the example headsets of FIGS. 1A and 3A.

FIG. 15 illustrates an example processor platform that may execute one or more of the instructions of FIGS. 13 and/or 14 to implement one or more of the example headset of FIGS. 1A-1E, the example headset of FIGS. 3A-3C, or the example circuit of FIG. 12.

DETAILED DESCRIPTION

Certain examples are shown in the above-identified figures and/or described in detail below. As used herein, “operatively coupled” is defined as connected directly or indirectly (e.g., through one or more intervening structures and/or layers).

Electroencephalography (EEG) data is indicative of electrical activity of neurons (e.g., neural depolarization) in a brain. The neural electrical activity may be due to stimuli of one or more of the five senses (e.g., evoked activity) and/or from thought processes (e.g., spontaneous activity). Summations of these electrical activities (e.g., brainwaves) propagate to the surface (e.g., the scalp) and are detectable with electroencephalograms. Current flow in the human body is typically due to ion flow. Thus, in examples described herein, a biopotential electrode is used to form an electrical double layer with the human skin to sense ion distribution(s). The electrical double layer is the interface or interaction between the ion flow in the body that causes the electron flow in the electrode (and other electronic circuitry).

EEG data can be classified in various frequency bands. Human brainwave frequencies include delta, theta, alpha, beta and gamma frequency ranges. Delta waves are classified as waves having frequencies of less than about 4 Hertz (Hz) and are prominent during sleep. Theta waves have frequencies between about 3.5 Hz to about 7.5 Hz and are associated with memories, attention, emotions, and sensations. Theta waves are typically prominent during states of internal focus. Alpha frequencies reside between about 7.5 Hz and about 13 Hz. Alpha waves are prominent during states of relaxation. Beta waves have a frequency range between about 14 Hz and about 30 Hz. Beta waves are prominent during states of motor control, long range synchronization between areas, analytical problem solving, judgment, and decision making. Gamma waves occur between about 30 Hz and about 100 Hz and are involved in binding of different populations of neurons together into a network for the purpose of carrying out a certain cognitive or motor function, and are also present during activity involving attention and/or memory. Skull and dermal layers tend to attenuate waves above about 75 Hz and, as a result, high gamma band or kappa band waves are less easily measured than waves in lower frequency bands.

EEG data may be used to determine an emotional or mental state of a person including, for example, attention, emotional engagement, memory or resonance, etc. As used herein, “attention” is a measure of sustained focus and/or shift(s) in focus over time. As used herein, “emotional engagement” is a measure of intensity of emotional response and automatic emotional classification of stimuli. As used herein, “memory” is a measure of a formation of connections and/or retention of information, which can be explicit (e.g., readily recalled) or implicit. As used herein, “resonance” is a measure of a quality of evoked response.

EEG signals may be measured using one or more electrodes placed on a scalp of a person (e.g., a user, a viewer, a subject, a panelist, a participant or a patient) to measure voltage fluctuations resulting from electrical activity associated with post synaptic currents occurring within neurons of the person's brain.

To enable surface EEG electrodes to effectively receive signals from the brain, the electrodes are placed close to the scalp. The electrodes may be manually placed upon a subject's head or may be contained in a wearable apparatus such as, for example, a headset. Many known EEG headsets utilize a bulky helmet or complicated head-strap type assembly. To decrease impedance and improve signal quality, these headsets are typically strapped tightly onto a user's head to decrease the distance between the electrodes and the tissue of the scalp. However, too much pressure (e.g., greater than two Newtons per millimeter square (N/mm²)) results in discomfort for most subjects. Further, these known headsets have limited adjustability and are often uncomfortable to wear because they do not adequately account for differently size(s) and/or shape(s) of heads.

Example headset(s) for receiving neuro-response data from a person's brain are disclosed herein. Example headsets disclosed herein are portable and comprise an electrode assembly having a plurality of adjustable strips. Such example headsets are adjustable to enhance comfort and reduce noise, as disclosed in greater detail below. Some such example headsets provide a simple, cost effective and reliable solution for the use of a large number of dry electrodes. Some such example headsets ensure comfort, good electrode contact, through the hair operation, and/or shielding against line noise and/or other type(s) of noise. Examples disclosed herein also include removable and adjustable components to enhance comfort, wearability and/or safety.

Example headsets disclosed herein include a first support to be disposed on a first side of a head of a person and a second support to be disposed on a second side of the head of the person. In some such examples, the headset also includes a first adjustor coupled to the first support, a first electrode strip and a first tension strap (e.g., an elastic member, a band, a string, a line, a strip, a spring, a belt, a tensioner, a cord, etc.) having a first end operatively coupled to the first adjustor and a second end operatively coupled to the second support.

In some such examples, the headset includes a second adjustor operatively coupled to the second support. In some such examples, the second end of the first tension strap is operatively coupled to the second support via the second adjustor.

Some example headsets include a second electrode strip and a second tension strap having a first end operatively coupled to the first support and a second end operatively coupled to the second support. In some examples, the first electrode strip and/or the second electrode strip are carried by the first and second supports. In some examples, the first end of the second tension strap is operatively coupled to the first adjustor on the first support. In some examples, the headset also includes a second adjustor operatively coupled to the first support. In some such examples, the first end of the second tension strap is operatively coupled to the second adjustor. In some example headsets, a second adjustor is operatively coupled to the second support. In some such examples, the second end of the second tension strap is operatively coupled to the second support via the second adjustor. In some examples, the headset includes a second adjustor on the second support and a third adjustor on the first support. In some such examples, the second end of the first tension strap is operatively coupled to the second support via the second adjustor and the first end of the second tension strap is operatively coupled to the first support via the third adjustor. In some such examples, the headset includes a fourth adjustor operatively coupled to the second support. In some such examples, the second end of the second tension strap is operatively coupled to the second support via the fourth adjustor. In some such examples, the first strip and the second strip are independently adjustable relative to the first support and the second support. In some examples, the first tension strap is slidably received by the first electrode strip and the second electrode strip.

In some examples, movement of the first adjustor changes a tension of the first tension strap. In some examples, movement of the first adjustor changes an effective length of the first tension strap. In some examples, the first adjustor comprises a wheel rotatably coupled to the first support. In some such examples, the first tension strap is wound about the wheel when the wheel is rotated. In some examples, the first adjustor comprises an electric motor to adjust the first tension strap.

In some examples, the first adjustor is detachable from the first support. In some examples, the first tension strap comprises nylon.

In some examples, the adjustment assembly includes a third support to be disposed under a right ear of the person and a fourth support to be disposed under a left ear of the person. In some examples, the first support is to be disposed above the right ear of the person and the second support is to be disposed above the left ear of the person. In some examples, the third support and the fourth support are adjustably coupled to the first support and the second support, respectively.

In some examples, the adjustment assembly includes a third support to be disposed on a front of the head of the person. In some such examples, the third support is adjustably coupled to the first support and the second support.

Some example headsets include a central support strip that is to be disposed along a top of the head of the person from a front of the head (e.g., a forehead) to a back of the head. In some examples, the first electrode strip is supported by the central support strip.

In some examples, the headset further includes a processing unit removably coupled to the central support strip. In some examples, the processing unit includes circuitry and/or a semiconductor based processor to at least one of amplify, filter, store or analyze signals gathered by electrodes on the headset. In some examples, the processing unit includes a first electrical connector and the central support strip includes a second electrical connector to mate with the first electrical connector.

In some examples, the central support strip comprises an annular rim and the processing unit comprises a hub to slidably receive the annular rim. In some examples, the headset includes a reference electrode and the processing unit comprises a port to communicatively couple the reference electrode to the processing unit.

In some examples, the first side is a rear of the head and the second side is a front of the head.

Also disclosed herein are headsets that include a first strip to be disposed over a head of a person and a first electrode unit operatively coupled to the first strip. In some such example headsets, the first electrode unit comprises a first housing and a first electrode pin that is retractable into the first housing.

In some examples, the first electrode unit includes a first spring to bias the first electrode pin outward from the first housing. In some such examples, the first spring is to provide about (e.g., +/−0.04 Newtons) 0.2 Newtons of force to the first electrode pin.

In some examples, the first electrode pin is retractable into the first housing from an extended position to a fully retracted position, wherein an end of the first electrode pin is substantially flush with a surface of the first housing.

In some examples, the first electrode unit comprises a second electrode pin that is retractable into the first housing. In some such examples, the first electrode pin and the second electrode pin are independently movable relative to the first housing. In some examples, the headset also includes a second electrode unit operatively coupled to the first strip, the second electrode unit having a second housing. In some such examples, the second electrode unit comprises a third pin and a fourth pin that are retractable into the second housing. In some examples, the headset includes a second strip to be disposed over the head of the user. In some such examples, the headset also includes a third electrode unit and a fourth electrode unit operatively coupled to the second strip, the third electrode unit having a third housing and the fourth electrode unit having a fourth housing. In some such examples, the third electrode unit comprises a fifth electrode pin that is retractable into the third housing and the fourth electrode unit comprises a sixth electrode pin that is retractable into the fourth housing.

In some examples, an end of the first electrode pin, which is to contact the head of a person, is substantially flat. In some examples, the first electrode pin has a diameter of about (e.g., +/−0.04 millimeters) 0.80 millimeters. In some examples, at least a portion of the first electrode pin is coated with silver.

In some examples, a surface of the first housing from which the first pin is extendable is curved. In some such examples, the surface of the first housing is concave.

In some examples, the first housing comprises a first channel to receive a first tension strap. In some such examples, the first housing comprises a second channel to receive a second tension strap. In some examples, the first tension strap and the second tension strap traverse along a longitudinal axis of the first strip. In some examples, the first channel and the second channel are substantially parallel (e.g., within +/−0.5 degrees of parallel). In some examples, tightening the first tension strap pulls the first electrode unit closer to or against the head of the person. In some such examples, the first electrode pin retracts into the first housing as the first electrode unit is pulled toward the head of the person. In some such examples, the first electrode pin is biased against the head of the user.

In some examples, the headset also includes a first tension strap slidably coupled to the first strip, a first support to be disposed on a first side of the head of the person and a second support to be disposed on a second side of the head of the person. In some such examples, a first end of the first tension strap is operatively coupled to the first support and a second end of the first tension strap is operatively coupled to the second support.

In some examples, the headset includes a first adjustor operatively coupled to the first support, and the first end of the first tension strap is operatively coupled to the first adjustor. In some such examples, the headset includes a second adjustor coupled to the second support, and the second end of the first tension strap is operatively coupled to the second adjustor. In some examples, the headset includes a second tension strap slidably coupled to the first strip. In some such examples, a first end of the second tension strap is operatively coupled to the first adjustor and a second end of the second tension strap is operatively coupled to the second adjustor.

In some examples, the headset includes a third support coupled to the first support and the second support via a second tension strap. In some such examples, the headset also includes a first adjustor coupled to the third support to change a tension of the second tension strap to move the first support and the second support in a first direction. In some such examples, the first adjustor comprises a wheel rotatably coupled to the third support. In some such examples, rotating the wheel changes the tension of the second tension strap. In some examples, the headset includes a second adjustor operatively coupled to the third support. In such an example, the third support is operatively coupled to the first support and the second support via a third tension strap. Also, in such an example, the second adjustor is to change a tension of the third tension strap to move the first support and the second support in a second direction, different than the first direction.

Also disclosed herein are methods that include adjusting a first adjustor to change a first tension in a first tension strap operatively coupled between a first support and a second support. In some such examples, the first support is to be disposed on a first side of a head of a person and the second support is to be disposed on a second side of the head of the person. In some examples, the first tension change causes the first tension strap to slide relative to a first electrode strip comprising a first electrode pin to thereby cause the first electrode strip to move to adjust a first distance of the first electrode strip relative to the head. Some such example methods also include gathering a first set of signals from the head using the first electrode pin.

In some examples, the method includes adjusting a second adjustor coupled to the second support to change the tension in the first tension strap.

In some example methods, adjusting the first adjustor changes a second tension in a second tension strap coupled between the first support and the second support. In some such examples, the second tension change causes the second tension strap to slide relative to a second electrode strip comprising a second electrode pin to thereby cause the second electrode strip to move to adjust a second distance of the second electrode strip relative to the head.

In some examples, the method includes changing an effective length of the first tension strap by adjusting the first adjustor. Also, in some examples, adjusting the first adjustor comprises rotating a wheel. In some examples, adjusting the first adjustor comprises actuating an electric motor.

Some example methods disclosed herein also include detaching the first adjustor from the first support to remove the first electrode strip.

Some example methods include adjusting a second adjustor to alter the position of a third support to be disposed under a right ear of the person and a fourth support to be disposed under a left ear of the person relative to the first support, which is to be disposed above the right ear of the person, and the second support, which is to be disposed above the left ear of the person.

Also disclosed herein are example methods wherein adjusting the first adjustor causes the first electrode pin to retract or extend from a first housing operatively coupled to the first electrode strip.

Turning now to the figures, FIGS. 1A-1E show an example headset 100 for gathering EEG signals from the head of a person. FIGS. 1A and 1B are right and left side views, respectively, of the headset 100 on a person's head. FIGS. 1C and 1D are perspective views of the right/rear side and the left/rear side, respectively, of the headset 100 on a person's head. FIG. 1E is a front view of the headset 100 on a person's head. The example headset 100 of FIGS. 1A-1E may be used, for instance, to gather medical information from a patient in a medical or a home environment, to control aspects of a game or other entertainment device, to provide data as part of a fitness regime, to collect audience measurement data, to control remote devices, for home automation, and/or for multiple other uses. The example headset 100 of FIGS. 1A-1E is intended to be worn on the head of a person, a user, a subject, a viewer, a participant and/or a panelist. A panelist may be, for example, a user registered on a panel maintained by a ratings entity (e.g., an audience measurement company) that owns and/or operates a ratings entity subsystem.

The example headset of FIGS. 1A-1E includes an electrode assembly 102 (e.g., a sensor module) and an adjustment assembly 104. The electrode assembly 102 of the illustrated example is generally located at the top and sides of the headset 100 and is structured to collect EEG signals. The adjustment assembly 104 of the illustrated example is the portion of the headset used to adjust the fit of the headset 100 to the head of a person. The electrode assembly 102 of the example headset 100 of FIGS. 1A-1E includes a plurality of strips including a first strip 106, a second strip 108, a third strip 110, a fourth strip 112 and a fifth strip 114. Each of the strips 106, 108, 110, 112, 114 includes a plurality of electrodes for receiving signals from the head of the user.

The electrode assembly 102 of the illustrated example includes a central support member 116. The strips 106-114 are operatively coupled to the central support member 116. In the illustrated example, the strips 106-114 and the central support member 116 are formed as a unitary piece (e.g., molded as one component). In other examples, one or more of the strips 106-114 and/or the central support member 116 are separate components that are mechanically coupled together to form the electrode assembly 102. In some examples, the distance between the respective strips 106-114 is fixed. However, in other examples, the electrode assembly 102 is adjustable to change the distance between any two of the strips 106-114 along the central support member 116. In some examples, the strips 106-114 are adjustably coupled to the central support member 116.

In the illustrated example, the electrode assembly 102 is worn on the head of a user such that the strips 106-114 are disposed over the head of the user and span between the left side of the head to the right side of the head. In the illustrated example, the central support member 116 is disposed over the head and extends between the back of the head to the front (e.g., the forehead) of the head. The example electrode assembly 102 of FIGS. 1A-1E is removably attached to the adjustment assembly 104, via the strips 106-114 (discussed in further detail below). The strips 106-114 of the illustrated example are moveable and adjustable (e.g., tightenable) on the head of the user to comfortably position the strips 106-114 on the head of the user for effective reading of neural electrical activity. In the illustrated example, the electrode assembly 102 includes five strips 106-114. However, in other examples, the electrode assembly 102 includes fewer or more strips (e.g., four or less strips, six strips, seven strips, ten or more strips, etc.) for disposing electrodes along the scalp of the user. Also, in other examples, one or more of the strips may be oriented perpendicularly, angularly and/or at different orientations than the other strips.

In the illustrated example, the first strip 106 includes a plurality of electrode units 117 that include one or more electrodes (discussed in further detail below). In the illustrated example, the electrodes units 117 of the first strip 106 are integrated into and/or operatively coupled to the first strip 106. The first strip 106 may also include internal electrical components (e.g., a printed circuit board (“PCB”), communication links, etc.) to transfer the electrical signals gathered by the electrode unit(s) 117 to a processor (discussed in further detail below). In the illustrated examples, the first strip 106 includes ten electrode units 117. In other examples, the first strip 106 includes more (e.g., twenty) or fewer electrode units.

In the illustrated example, the electrode units 117 of the first strip 106 are aligned along the length (e.g., the longitudinal axis) of the first strip 106. In other examples, the first strip 106 includes pairs of electrodes along the length such as, for example, in a spine-like structure. Disclosure of example spine structures can be found in U.S. patent application Ser. No. 13/728,900, titled “SYSTEMS AND METHODS TO GATHER AND ANALYZE ELECTROENCEPHALOGRAPHIC DATA,” filed on Dec. 27, 2012; U.S. patent application Ser. No. 13/728,913 titled “SYSTEMS AND METHODS TO GATHER AND ANALYZE ELECTROENCEPHALOGRAPHIC DATA,” filed on Dec. 27, 2012; and U.S. patent application Ser. No. 13/730,212, titled “SYSTEMS AND METHODS TO GATHER AND ANALYZE ELECTROENCEPHALOGRAPHIC DATA,” filed on Dec. 28, 2012, all of which claim priority to U.S. Provisional Patent Application Ser. No. 61/684,640, titled SYSTEMS AND METHODS TO GATHER AND ANALYZE ELECTROENCEPHALOGRPHIC DATA, filed on Aug. 17, 2012, and all of which are incorporated herein by reference in their entireties.

In the illustrated example of FIGS. 1A-1E, the first example strip 106 includes a first tension strap 118 and a second tension strap 120. The first tension strap 118 and the second tension strap 120 of the first strip 106 are slidably coupled to the first strip 106 and are adjustable (e.g., tightenable and/or releasable) along the first strip 106 to provide a downward force toward or against the scalp of the user. The first and second tension straps 118, 120 of the first strip 106 extend through openings formed in the electrode units (described in further detail below). Thus, increasing or decreasing the tension in the first and second straps 118, 120 of the first strip 106 moves the first strip 106 and the electrode units 117 closer to or further from the scalp of the user. The first and second tension straps 118, 120 of the first strip 106 may comprise wires, cords, lines, ties, straps, tethers, springs, belts, adjustment elements, and/or other suitable connecting elements. In some examples, the first and second tension straps 118, 120 of the first strip 106 comprise nylon. Additionally or alternatively, in some examples, the first and second tension straps 118, 120 of the first strip 106 are stretchable and comprise an elastic element.

In the illustrated example shown in FIGS. 1A-1E, the first and second tension straps 118, 120 of the first strip 106 are adjustable to change forces imparted by electrode pins (e.g., electrode pins 218, 220, 222 shown in FIGS. 2A-2C and disclosed in detail below) of the electrode units 117 on the scalp of the user. For example, when first and second tension straps 118, 120 of the first strip 106 are tightened, the first and second tension straps 118, 120 provide a downward force to pull the first strip 106 and the respective electrode units 117 toward and/or against the scalp of the user. The first and second tension straps 118, 120 may be tightened, for example, to increase signal quality for the signals gathered by the electrode units 117. Additionally, when the first and second tension straps 118, 120 of the first strip 106 are loosened, the first and second tension straps 118, 120 decrease the downward force and allow the electrode units 117 of the first strip 106 to move away from the head, which could provide increased comfort to a person wearing the headset 100.

In the illustrated example of FIGS. 1A-1E, the second strip 108, the third strip 110, the fourth strip 112 and the fifth strip 114 also include a respective first tension strap, a respective second tension strap, and a plurality of electrode units 117, similar to the first strip 106 described above. Specifically, the second strip 108 includes a first tension strap 122 and a second tension strap 124, the third strip 110 includes a first tension strap 126 and a second tension strap 128, the fourth strip 112 includes a first tension strap 130 and a second tension strap 132 and the fifth strip 114 includes a first tension strap 134 and a second tension strap 136. In the example, each of the strips 108-114 slidably receives the respective first and second tension straps 122-136, as described above with the first strip 106. Each of the tension straps 122-136 may likewise comprise wires, cords, lines, ties, straps, tethers, springs, belts, adjustment elements, nylon, elastic and/or other suitable connecting elements, similar to the first and second tensions straps 118, 120 of the first strip 106. In some examples, each of the strips 106-114 includes only one tension strap. However, in other examples, each of the strips 106-114 includes three or more tension straps. In some examples, the strips 106-114 include a different number of tension straps depending on the desired adjustment capabilities. For example, one of the strips may only include one tension strap while another strip on the same headset may include two or more tension straps.

In some examples, each of the strips 106-114 includes ten to twenty electrode units 117, such that the example headset 100 includes fifty to one hundred electrode units. In other examples, the headset 100 and/or one or more of the strips 106-114 include more or fewer electrode units.

Similar to the first strip 106 describe above, the respective first and second tension straps 122-136 of the second, third, fourth and fifth strips 108-114 are adjustable (e.g., tightenable and/or releasable) along the respective strips 108-114 to change forces imparted by the electrode pins (e.g., electrode pins 218, 220, 222 shown in FIGS. 2A-2C and disclosed in detail below) of the electrode units 117 of the strips 108-114 on the scalp of the user. Each of the strips 106-114 is independently adjustable (e.g., via its respective tension straps 118-136), relative to the other strips 106-114, to position each of the strips 106-118 against the head of the user with a desired degree of tension.

The example strips 106-114 and the central support member 116 of the illustrated example are constructed of a flexible material such as, for example, a plastic (e.g., a thermoplastic), a rubber, a polyurethane, a silicone and/or any other suitable material or combination of materials. The flexibility of the example strips 106-114 and the central support member 116 enables the electrode assembly 102 to sit comfortably on the head of a person and to adjust to the shape of the head of the person without applying an uncomfortable and/or painful force to the head. The flexibility of the example strips 106-114 and the central support member 116 also enables the electrode assembly 102 to lie close to the scalp of the user to allow the electrodes of the electrode units 117 of the strips 106-114 to engage the surface of the scalp, thus, resulting in better contact and signal collection.

The example strips 106-114 of FIGS. 1A-1E are removably attached to the adjustment assembly 104. As shown in FIGS. 1A-1E, the adjustment assembly 104 includes a first support or band 138 that is to be disposed on a first side (e.g., the right side) of the head of the user and a second support or band 140 that is to be disposed on a second side (e.g., the left side) of the head of the user. In some examples, the first support 138 and the second support 140 are constructed of a flexible material such as, for example, a plastic (e.g., a thermoplastic), a rubber, a polyurethane, a silicone and/or any other suitable material or combination of materials.

The example headset 100 of FIGS. 1A-1E includes a first adjustor 142, a second adjustor 144 and a third adjustor 146. The first adjustor 142, the second adjustor 144 and third adjustor 146 are removably coupled to the first support 138. Likewise, in the example shown in FIG. 1B, a fourth adjustor 148, a fifth adjustor 150 and a sixth adjustor 152 are removably coupled to the second support 140. The adjustors 142-152 of the illustrated example are spaced along respective supports 138, 140 and adjustably couple the strips 106-114 of the electrode assembly 102 to the first and second supports 138, 140 via respective tension straps 118-136.

In the illustrated example shown in FIGS. 1A-1E, the first and second tension straps 118, 120 of the first strip 106 are operatively coupled to the first adjustor 142 on the first support 138 on the right side of the head of the user and operatively coupled to the fourth adjustor 148 on the second support 140 on the left side of the head of the user. The first and fourth adjustors 142, 148 are operable to change tension in and/or alter effective lengths of the first and second tension straps 118, 120 of the first strip 106. Thus, the first and fourth adjustors 142, 148 change the location and/or pressure (e.g., change the application of force or compression) of the first strip 106 on the head of the user.

In the illustrated example shown in FIGS. 1A-1E, the first and fourth adjustors 142, 148 include wheels (e.g., knobs or other rotatable elements) that are rotatably and removably attached to the first and second supports 138, 140. As the wheel of the first adjustor 142 rotates, the first and second tension straps 118, 120 of the first strip 106 are wound onto the wheel and, thus, the effective lengths of the first and second tension straps 118, 120 are altered. As a result, the first and second tension straps 118, 120 of the first strip 106 tighten or loosen, which changes the tension of the tension straps 118, 120 and the forces pulling the first strip 106 and the electrode units 117 against the head of the user. In some examples, the wheel of the first adjustor 142 is held in position by friction, such that when a user rotates the wheel in one direction (e.g., to tighten the electrode assembly 102), friction prevents the wheel from turning back in the other direction (e.g., due to the tension forces in the first and second tension straps 118, 120 and biasing forces acting in the opposite direction, which are disclosed in greater detail below). In other examples, the adjustor 142 includes a ratchet assembly to lock the wheel in a position. In still other examples, the adjustor 142 includes an electric motor to adjust (e.g., automatically) the tension in the first and second tension straps 118, 120.

Similar to the attachment of the first and second tension straps 118, 120 of the first strip 106 to the first and fourth adjustors 142, 148, each of the strips 108-114 is likewise attached to respective ones of the adjustors 142-152, as shown in the illustrated example of FIGS. 1A-1E. Specifically, the second strip 108 is attached to the first and fourth adjustors 142, 148, the third strip 110 is attached to the second and fifth adjustors 142, 150, the fourth strip 112 is attached to the third and sixth adjustors 146, 152, and the fifth strip 114 is attached to the third and sixth adjustors 146, 152. The tension straps 118-136 of the strips 106-114 of the illustrated example are coupled to the adjustors 142-152 such that the adjustors 142-152 are able to change tension in and/or alter effective lengths of the tension straps 118-136. Specifically, the first and second tension straps 122, 124 of the second strip 108 are coupled to the first and fourth adjustors 142, 148, the first and second tension straps 126, 128 of the third strip 110 are coupled to the second and fifth adjustors 142, 150, the first and second tension straps 130, 138 of the fourth strip 112 are coupled to the third and sixth adjustors 146, 152, and the first and second tension straps 134, 136 of the fifth strip 114 are coupled to the third and sixth adjustors 146, 152. Thus, the adjustors 142-152 change the location and/or pressure (e.g., change the application of force or compression) of respective ones of the strips 106-114 on the head of the user. In some examples, the adjustors are not removably coupled to a respective support. In some examples, one or more of the strips 106-114 is carried by the first and second supports 138, 140.

Specifically, as shown in the example of FIG. 1A, the first and second tension straps 118, 120 of the first strip 106 and the first and second tension straps 122, 124 of the second strip 108 are operatively coupled to the first adjustor 142 on the first support 138. Also, the first and second tension straps 126, 128 of the third strip 110 of the illustrated example are operatively coupled to the second adjustor 144 on the first support 138. Further, in the example of FIGS. 1A-1E, the first and second tension straps 130, 132 of the fourth strip 112 and the first and second tension straps 134, 136 of the fifth strip 114 are operatively coupled to the third adjustor 146 on the first support 138. Thus, in the illustrated example, a single adjustor may simultaneously adjust a plurality of tension straps. In other examples, one adjustor controls one tension strap. In still other examples, a first tension strap of a strip may be coupled to a first adjustor, and a second tension strap of the same strip may be coupled to a second adjustor. In such example, a strip may be finely adjusted by variably and independently changing a pressure on different sides of the strip.

Similarly, as shown on the left side of the head in FIG. 1B, the first and second tension straps 118, 120 of the first strip 106 and the first and second tension straps 122, 124 of the second strip 108 are operatively coupled to the fourth adjustor 148 on the second support 140. The first and second tension straps 126, 128 of the third strip 110 are operatively coupled to the fifth adjustor 150 on the second support 140, and the first and second tension straps 130, 132 of the fourth strip 112 and the first and second tension straps 134, 136 of the fifth strip 114 are operatively coupled to the sixth adjustor 152 on the second support 140.

In the illustrated example, each of the first and second supports 138, 140 includes three adjustors. However, in other examples, the headset 100 may include more or fewer adjustors. In some examples, five adjustors are coupled to each of the first and second supports 138, 140, one for each of the respective strips 106-114 of the electrode assembly 102. In other words, in some examples, each strip 106-114 is attached to a different adjustor on each end, as described above. In some examples, each of the strips 106-114 is independently adjustable relative to the other strips 106-114. In other examples, the first and second supports 138, 140 each include only one adjustor such that all of the tension straps 118-136 are all attached to the single adjustor on each side of the head. In such an example, the strips 106-114 are simultaneously adjustable on each end.

In the illustrated example, the strips 106-114 are coupled to the first and second supports 138, 140 via the adjustors 142-152. However, in other examples, the headset 100 lacks the fourth, fifth and sixth adjustors 148-152, and the second ends of the tension straps 118-136 are fixedly coupled to the second support 140. Alternatively, in other examples, the headset 100 lacks the first, second and third adjustors 142-146, and the first ends of the tension straps 118-136 are fixedly coupled to the first support 140. In other words, in some examples, an adjustor may be located on only one of the first or second supports 138, 140 to adjust a respective strip. In yet other examples, some strips are coupled to adjustors on one support and other strips are coupled to adjustors on another support.

Similar to the first adjustor 142 described above, the other adjustors 144-152 of the illustrated example also include wheels (e.g., knobs or other rotatable elements) that are rotatably and removably attached to the first and second supports 138, 140. In the illustrated example, the adjustors 142-152 are independently adjustable relative to the other adjustors 142-152. The arrangement of the adjustors 142-152 of the illustrated example enables the strips 106-114 to be disposed over the head of the person and attached to the first and second supports 138, 140, respectively.

In some examples, the adjustors 142-152 are detachable from the respective first and second supports 138, 142. In some examples, the adjustors 142-152 are coupled to the respective tension straps 118-136 first, and then the electrode assembly 102 is attached to the adjustment assembly 104 by attaching the adjustors 142-152 to the first and second supports 138, 140. The adjustors 142-152 may be removably attached to the respective first and second supports 138, 140 using any suitable releasable fastening mechanism(s). In some examples, the adjustors 142-152 include magnets to mate with other magnets or magnetic components associated with the first and second supports 138, 140, or vice versa. A description of an example magnetic attachment assembly can be found in U.S. patent application Ser. No. 13/829,849, titled “METHODS TO APPARATUS TO GATHER AND ANALYZE ELECTROENCEPHALOGRAPHIC DATA,” filed on Mar. 14, 2013, which is incorporated herein by reference in its entirety.

In the example headset 100 of FIGS. 1A-1E, the adjustment assembly 104 also includes a rear support 154 and a front support 156. The front support 156 is to be disposed on a forehead, and the rear support 154 is to be disposed on the back of the head. In some examples, the rear support 154 is disposed below the inion of the occipital bone as shown in FIGS. 1C and 1D. In some examples, the rear support 154 is constructed of a flexible material such as, for example, a plastic (e.g., a thermoplastic), a rubber, a polyurethane, a silicone and/or any other suitable material or combination of materials. In some examples the rear support 154 is a solid unitary piece. However, in other examples, the rear support 154 is constructed of multiple sections or portions that are fastened together (e.g., via a snap fastener, a tie, a loop and hook fastener such as a VELCRO® fastener, or any other suitable fastener).

In the illustrated example, the adjustment assembly 104 includes a first adjustment line 158 and a second adjustment line 160. In some examples, the first and second adjustment lines 158, 160 are similar in structure and/or function to the tension straps 118-136. The adjustment lines 158, 160 may be implemented by a wire, a cord, a tie, a strap, a tether and/or any other suitable connecting elements. In some examples, the adjustment lines 158, 160 include nylon. Additionally or alternatively, in some examples, the adjustment lines 158, 160 are stretchable and include an elastic element.

In the example of FIGS. 1A-1E, the first adjustment line 158 is slidably received by the rear support 154 and is coupled to the first support 138, the second support 140 and the front support 156. In the illustrated example, the first adjustment line 158 passes through the length of the first support 138 and the length of the second support 140 to the front support 156. In some examples, the first adjustment line 158 is a complete band or loop, while in other examples, the first adjustment line 158 includes separate sections or components coupled together.

In the illustrated example, the rear support 154 includes a first rear adjustor 162 to change a tension of the first adjustment line 158. The first adjustment line 158 of the illustrated example is slidably received within a channel (e.g., a passage, a through hole, a conduit) in the rear support 154. In some examples, the first rear adjustor 162 includes a wheel that is rotatable to change an effective length of the first adjustment line 158 and, thus tighten or loosen the tension of the first adjustment line 158. As the first adjustment line 158 is tightened, the forces in the first adjustment line 158 pull the first and second supports 138, 140 backward towards the rear support 154 on the back of the head and/or pulls the rear support 154 forward. The tension also pulls the front support 156 against the forehead of the user, which more securely holds the headset 100 on the head. This adjustment arrangement allows the headset to be adjusted for users with differently sized heads to adjust the distance between the rear support 154, the first and second support 138, 140 and the front support 156. Thus, one headset 100 can accommodate different head sizes.

In addition, different headset templates of different sizes may be used to accommodate different head sizes of different ranges. For example, one headset template could be used for a first range of smaller head sizes and another template could be used for a second range of larger head sizes. In some examples, the different templates could include different size electrode assemblies and/or different sized adjustment assemblies to accommodate different size heads. For example, a person with a head measuring 62-64 centimeters (cm) in circumference may use an electrode assembly with strips measuring a first length, and a person with a head measuring 58-62 cm in circumference may use an electrode assembly with strips measuring a second length, shorter than the first length. Therefore a plurality of different sized electrode assemblies and/or adjustment assemblies may be used with a headset to comfortably accommodate any sized/shape head.

As noted above, the adjustment assembly 104 of the illustrated example also includes the second adjustment line 160. The second adjustment line 160 is slidably received by the rear support 154 and is coupled to the first support 138, the second support 140 and the front support 156. The second adjustment line 160 of this example is slidably received within a channel (e.g., a passage, a through hole, a conduit) in the rear support 154. As shown in FIGS. 1A-1D, the rear support 154 of the illustrated example includes two lower guide sections 166, 168, which extend below the ears of the user. The second adjustment line 160 passes through the lower guide sections 166, 168 (e.g., under the ears) and is directed upward toward front ends of the first and second supports 138, 140. In some examples, the second adjustment line 160 is formed of a complete loop, while in other examples, the second adjustment line 160 includes separate sections or components coupled together.

The rear support 154 also includes a second rear adjustor 164 to change a tension of the second adjustment line 160. In some examples, the second rear adjustor 164 includes a wheel that is rotatable to change an effective length of the second adjustment line 160 and, thus, adjust the tension in the second adjustment line 160. As the second adjustment line 160 is tightened, the forces in the second adjustment line 160 pull the first and second supports 138, 140 downward toward the ends of the guides 166, 168, which are positioned below the ears and/or pulls the rear support 154 and/or the guides 166, 168 upward and/or forward. This adjustment further aides the accommodation of differently sized heads.

In some examples, the front support 156 is constructed of a flexible material such as, for example, a plastic (e.g., a thermoplastic), a rubber, a polyurethane, a silicone, and/or any other suitable material or combination of materials. Also, in some examples, the front support 156 incorporates one or more individual electrodes (e.g., reference electrodes) positioned to receive signals from the frontal area of the head. In some examples, a clip structure may be used to attach the electrodes to the front of the head. An example electrode clip is disclosed in U.S. patent application Ser. No. 13/829,849, mentioned above and incorporated herein by reference in its entirety.

In the illustrated example, the headset 100 also includes a processing unit 170 that is removably coupled to the central support member 116 of the electrode assembly 102 (described in further detail below). In the illustrated example, the central support member 116 communicatively couples the electrodes of the electrode units 117 of the strips 106-114 to the processing unit 170. For example, the central support member 116 communicatively couples the electrodes of the example strips 106-114 to the processing unit 170 via communication links (e.g., wires, a ribbon, a flexible printed circuit board (FPCB), a printed circuit board (PCB)) running through the central support member 116 and/or the strips 106-114. In other examples, the strips 106-114 are wirelessly coupled to the processing unit 170 and/or a remote processor. For example, one or more of the strips 106-114 may include a transmitter to wirelessly transmit signals (e.g., EEG signals) to the processing unit 170. In such examples, the central support member 116 supports the strips 106-114 and provides rigidity and structure to the electrode assembly 102 but does not function to convey communication signals. In still other examples, the headset 100 does not include the processing unit 170, and the signals are communicated to a handheld or other remote receiver.

In the illustrated example, the processing unit 170 has a housing that includes the electrical components for conditioning and/or processing signals gathered from the electrodes (described in further detail below). In some examples, the electrical components include circuitry (e.g., filter, amplifier, digital-to-analog converter(s), processor(s)) to, for example, convert the EEG data from analog data to digital data, amplify the EEG data, remove noise from the data, analyze the data, and transmit the data to a processor, computer, and/or other remote receiver or processing unit. In some examples, the processing unit 170 includes hardware and software such as, for example, an amplifier, a signal conditioner, a data processor and/or a transmitter for transmitting signals to a data center, processor, and/or a computer. In other examples, some of the processing occurs at the headset 100 and some processing occurs remotely after the headset 100 transmits data or semi-processed results to a remote site such as, for example, via a wireless connection. In some examples, the processing unit 170 is removably attached to the headset 100. In some such examples, the processing unit 170 may be removed and replaced with a different processing unit that may have, for example, different programming functions and/or analysis tools. In some examples, a plurality of processing units may contain different preprogrammed analysis tools and the processing units may be interchanged depending on the desired function (e.g., controlling entertainment such as a game or gathering data for a medical diagnosis) of the headset 100.

As shown in FIGS. 1A and 1B, the processing unit 170 of the illustrated example also includes electromechanical receivers 172, 174, which may be used, for example, to physically and electrically connect terminals of additional electrodes or sensors to the processing unit 170. In some examples, the electromechanical receivers 172, 174 are used for attaching other electrodes or physiological/biological measurement devices (e.g., an EKG sensor, an eye tracking sensor, etc.). The additional devices may include terminals having mating electromechanical connectors or terminals (e.g., apertures and pins, connection points) that may be attached to the processing unit 170 and/or to other terminals attached to the processing unit 170. In some examples, an electrode is used as a reference or ground electrode to provide a reference signal for comparing with the EEG signals gathered from other parts of the head by, for example, the headset 100 shown in FIGS. 1A-1E. A reference or ground electrode is positioned at a point on the body (e.g., an ear or nose) that has little (e.g., minimal) or no EEG activity or other artifacts and/or noise such as, for example, those indicative of muscle contractions or blood flow. In such an example, the ground electrode may include a terminal that connects to one of the receivers 172, 174 on the processing unit 170. An example terminal and receiver structure is disclosed in U.S. patent application Ser. No. 13/829,849, mentioned above and incorporated herein by reference in its entirety.

In use of the example headset 100 of FIGS. 1A-1E, the electrode assembly 102 is attached to the adjustment assembly 104 (e.g., via the tension straps 118-136 and adjustors 142-152) and the headset 100 is then placed on the head of a user. The processing unit 170 may be attached to the central support member 116 (described in further detail below) prior to or subsequent to placing the headset 100 on the head of a person. In other examples, the adjustment assembly 104 is placed on the head of a person (e.g., by stretching the first and second adjustment lines 158, 160 over the head of the user) and coupling the example electrode assembly 102 to the adjustment assembly 104 (e.g., by connecting the tension straps 118-136 to the respective adjustors 142-152).

The adjustors 142-152 of the illustrated example operate to change the tension (e.g., via the effective length) of the tension straps 118-136 and, thus, create more or less force in the strips 106-114 against the head of the user. For example, in the case of a smaller head, the example first adjustor 142 on the first support 138 and/or the example fourth adjustor 148 on the second support 140 may be used to create more tension in the first and second tension straps 118, 128 until the first strip 106 applies a desired amount of pressure against the head of the person. Additionally, the first and second rear adjustors 162, 164 operate to adjust to the position of the first and second supports 138, 140 to further adjust the headset 100 on the head of the user.

As mentioned above, in some examples, the adjustors 142-152 are removably attached to the first and second supports 138, 140. The removability of the adjustors 142-152 provides a safety function by enabling the example electrode assembly 102 to easily be disconnected from the adjustment assembly 104 if too much force is exerted on the electrode assembly 102. For example, if one of the strips 106-114 of the electrode assembly 102 is snagged or caught on a foreign object, one or more of the example adjustor(s) 142-152 release, and the example electrode assembly 102 disconnects or partially disconnects from the adjustment assembly 104.

FIGS. 2A-2C are enlarged views of a portion of the first strip 106 having an electrode unit 117. The illustrated view shows the bottom of the first strip facing upward. In use, the bottom of the first strip 106 would face the head of the user. Although only one electrode unit 117 of one strip 106 is shown and described here, this electrode unit 117 is similar to any or all of the other electrode units 117 coupled to the strips 106-114. The electrode unit 117 of the example of FIG. 2A extends from a bottom surface 200 of the first strip 106. In this example, the electrode unit 117 includes a housing 202 (e.g., a body) comprised of an extension member 204 and a contact member 206. The electrode unit 117 of the illustrated example includes three electrodes 212, 214, 216 extending from the contact member 206 to contact the scalp of the user to gather EEG signals from the brain. Other examples use fewer or more electrodes. The extension member 204 of the illustrated example separates the contact member 206 from the bottom surface 200 of the first strip 106. In other examples, no extension member is utilized and the contact member 206 is coupled directly to the first strip 106.

As shown in the illustrated example, the housing 202 of the electrode unit 117 includes a first channel 208 (e.g., a wire guide, a slot, a passage, an opening, an aperture, a hole, etc.) and a second channel 210 (on the opposite side of the electrode unit 117). The first channel 208 is to slidably receive the first tension strap 118 of the first strip 106, and the second channel 210 is to slidably receive the second tension strap 128 of the first strip 106. The first and second channels 208, 210 may be any shape and/or have any cross-section to enable the first and second tension straps 118, 128 to slide through the respective channels 208, 210. In the illustrated example, the first and second channels 208, 210 are substantially parallel. As the first and second tension straps 118, 128 of the first strip 106 are pulled toward the scalp (e.g., when the tension is increased by the adjustors 142, 148), the first and second tension straps 118, 128 pull the contact member 206 of the electrode unit 117 closer to the scalp of the user.

In the illustrated example, the electrode unit 117 includes three electrodes 212, 214, 216. However, in other examples, the electrode unit 117 may include more or fewer electrodes (e.g., one, two, ten, etc.). Also, in some examples, each of the electrode units 117 of the strips 106-114 may contain a different number of electrodes (e.g., a first electrode unit on the first strip 106 includes four electrodes and a first electrode unit on the second strip 108 includes two electrodes).

In the example shown in FIGS. 2A-2C, the first electrode 212 includes a first electrode pin 218 and a first body 224, the second electrode 214 includes a second electrode pin 220 and a second body 226, and the third electrode 216 includes a third electrode pin 222 and a third body 228. The electrode pins 218, 220, 222 are independently retractable relative to the respective body 224, 226, 228 (and, thus, independently movable relative to the housing 202). As shown in FIG. 7A, the first body 224 of the first electrode 212 is larger than the first electrode pin 218. The first electrode pin 218 is movable into and out of the end of the first body 224. In some examples, the electrodes 212, 214, 216 include springs disposed within the respective bodies 224, 226, 228 to bias the electrode pins 218, 220, 222 outward.

In the example shown in FIGS. 2A-2C, the bodies 224, 226, 228 of the respective electrodes 212, 214, 216 are disposed within the housing 202 of the electrode unit 117, and the electrode pins 218, 220, 222 extend from a bottom surface 230 of the contact member 206. The pins 218, 220, 222 of the illustrated example retract into the housing 202 as the ends of the pins engage the head of the user and are forced into the housing 202 as the contact member 206 moves toward the head of the user.

FIG. 2A illustrates an example in which the electrode pins 218, 220, 222 are fully extended such as, for example, when the electrode pins 218, 220, 222 are not engaged with the head of the user or are initially placed on the user's head. FIG. 2B illustrates an example in which the electrode pins 218, 220, 222 are partially retracted or pressed into the respective electrode bodies 224, 226, 228 in the housing 202. As the ends of the pins contact the head of the user, the springs provide a biasing force to extend the pins 218, 220, 222 outward and against the scalp, which assists in creating surface contact with the scalp of the user. FIG. 2C illustrates an example in which the electrodes pins 218, 220, 222 are completely retracted such as, for example, when the bottom surface 230 of the housing 202 is against the scalp of the user.

As shown in FIGS. 2A-2C, the bottom surface 230 of the contact member 206 is contoured or curved (e.g., concave). The contoured profile creates a more comfortable interface between the bottom surface 230 and the scalp of the user by conforming, generally (e.g., not necessarily exactly but close enough for comfort), to the curve of the head in those examples in which the respective strip is adjusted or tightened enough that the contact member 206 contacts the head. Also, in some examples, the distance between the first and second channels 208, 210 and the bottom surface 230 of the housing 202 is about two to about three millimeters to place the tension straps 118, 128 sufficiently away from the user's hair to reduce the potential for the tension straps 118, 128 to catch in the hair and cause discomfort (e.g., during removal of the headset).

As shown in FIGS. 2A-2C, a FPCB 232 is molded within the first strip 106. The FPCB 232 may include communication links (e.g., wires, traces, etc.) to transfer the signals gathered from the electrodes of the first strip 106. The electrodes 212, 214, 216 are communicatively coupled to the FPCB 232 (e.g., via electrical contact between the electrodes 212, 214, 216 and the FPCB 232 and/or one or more intermediate wires or conductive surfaces).

FIGS. 3A-3C illustrate another example headset 300 for gathering EEG signals from the head of a person. FIGS. 3A and 3C are perspective views of the front and rear of the headset 300, respectively. FIG. 3B is a left side view of the example headset 300 on a head of a user or subject. Similar to the example headset 100 disclosed above, the example headset 300 of FIGS. 3A-3C includes an electrode assembly 302 (e.g., a sensor module) having a first strip 304, a second strip 306, a third strip 308, a fourth strip 310 and a fifth strip 312. Each of the strips 302-312 includes a plurality of electrodes, and each of the strips 302-312 is operatively coupled to a central support member 314 and a processing unit 315 is operatively coupled to the central support member 314 to receive, store, process and/or transmit the gathered EEG signals.

In the illustrated example shown in FIGS. 3A-3B, the electrode assembly 302 is worn on the head of a user such that the strips 304-312 are disposed over the head of the user from the left side of the head to the right side of the head and the central support member 314 is disposed over the head and extends from the back of the head to the front of the head (e.g., to the forehead). The strips 304-312 and the central support member 314 of the illustrated example are flexible and may conform to the shape of the head when flexed. The example strips 304-312 and the central support member 314 of the illustrated example are constructed of a flexible material such as, for example, a plastic (e.g., a thermoplastic), a rubber, a polyurethane, a silicone and/or any other suitable material or combination of materials.

As shown in the illustrated example of FIGS. 3A-3C, the headset 300 also includes a headband 316. In the illustrated example, the headband 316 is constructed of, for example, nylon or any other elastic material. In the example shown in FIG. 3A, the first strip 304 is operatively coupled to the headband 316 and the headband 316 surrounds the head. As shown in the example of FIGS. 3B and 3C, a base 318 is operatively coupled to the rear of the headband 316 and is to be disposed below the inion or occipital bone.

As shown in FIGS. 3A-3C, each of the strips 304-312 of the illustrated example has a plurality of electrode units (e.g., electrode clusters) disposed on a bottom side of the respective strips 304-312. FIG. 4 illustrates a bottom view of the electrode assembly 302 of FIGS. 3A-3C. Specifically, in the illustrated example, the first strip 304 includes three electrode units 321, the second strip 306 includes nine electrode units 321, the third 308 strip includes nine electrode units 321, the fourth strip 310 includes nine electrodes 321, and the fifth strip 312 includes three electrodes 321. In total, the electrode assembly 302 of the illustrated example includes thirty-three electrode units. However, in other examples, the electrode assembly 302 may include more or fewer electrode units. Each of the electrode units 320, 321 includes one or more electrodes to engage the scalp of a user and receive EEG signals from the brain. In the example shown in FIG. 4, the electrode units 320 carried by the first strip 304 (discussed in FIG. 6) are different than the electrode units 321 carried by the second, third, fourth and fifth strips 306-312.

Unlike the headset 100 of FIGS. 1A-1E, where the tension straps 118-136 are disposed along the length or longitudinal axis of the respective strips 106-114, the example headset 300 of FIGS. 3A-3C utilizes tension straps 322-356 that are oriented substantially perpendicular to the strips 304-312 and that traverse from the front side of the head (e.g., at the first strip 304) to the back side of the head. Each of the electrode units 321 includes holes or wire guides for receiving the respective tension straps 322-356. Specifically, in this example, each of the electrode units 321 includes two holes or apertures to receive two of the tension straps 322-356. Similar to the headset 100 of FIGS. 1A-1E, the tension straps 322-356 may be pulled tight to move the electrode assembly 302 closer to the head of the person wearing the headset 300. The tension straps 322-356 may comprise wires, cords, lines, ties, straps, tethers, springs, belts, adjustment elements, and/or other suitable connecting elements. In some examples, the tension straps 322-356 comprise nylon. Additionally or alternatively, in some examples, the tension straps 322-356 are stretchable and comprise an elastic element.

In the example of FIGS. 3A-3C, each of the tension straps 322-356 is coupled to the first strip 304 and/or the headband 316 (e.g., a first support) on one end and operatively coupled to an adjustor 358 in the rear of the headset 300 at the opposite end. The adjustor 358 is removably coupled to the base 318 (e.g., a second support). The adjustor 358 is used to shorten the effective lengths of the tension straps 322-356. Specifically, as the tensions straps 322-356 are tightened, the electrode assembly 302 is pulled down and closer to the head of the person allowing the electrodes to move closer to the scalp.

As also shown in FIG. 4, the first strip 304 of the illustrated example includes three electrode units 320. Further, in the example, the second, third and fourth strips 306, 308, 310 each include nine electrode units 321. The fifth strip 312 includes three electrode units 321. The second, third and fourth strips 306, 308 310 of the illustrated example are curved to conform to the shape of the head.

As illustrated in FIGS. 3A-3C, the first and second tension straps 322, 324 are operatively coupled (e.g., indirectly or directly coupled) to the first strip 304 and/or the headband 316 at the front of the head. The first and second tension straps 322, 324 are slidably coupled to (1) a first one of the electrode units 321 on the second strip 306, (2) a first one of the electrode units 321 on the third strip 308, and (3) a first one of the electrode units 321 on the fourth strip 310. The first and second tension straps 322, 324 of the illustrated example are also operatively coupled to the adjustor 358 disposed in the rear of the headset 100. Thus, when tightened, the first and second tension straps 322, 324 of the illustrated example pull the first ones of the electrode units 321 on the second, third, and fourth strips 306, 308, 310 downward toward the left side of the head.

Similarly, the third and fourth tension straps 326, 328 of the illustrated example are operatively coupled to the first strip 304 and/or the headband 316, slidably coupled to a second one of the electrode units 321 on the second, third and fourth strips 306, 308, 310 and are operatively coupled to the adjustor 358 disposed in the rear of the headset 100. Thus, when tightened, the third and fourth tension straps 326, 328 pull the second ones of the electrode units 321 on the second, third, and fourth strips 306, 308, 310 downward toward the side of the head.

In the illustrated example, the fifth and sixth tension straps 330, 332 are operatively coupled to the first strip 304 and/or the headband 316, slidably coupled to a third one of the electrode units 321 on each of the second, third and fourth strips 306, 308, 310, slidably coupled to a first one of the electrodes 321 on the fifth strip 312 and are operatively coupled to the adjustor 358 disposed in the rear of the headset 100. In the illustrated example, the seventh and eighth tension straps 334, 336 are operatively coupled to the first strip 304 and/or the headband 316, slidably coupled to a fourth one of the electrode units 321 on each of the second, third and fourth strips 306, 308, 310, and are operatively coupled to the adjustor 358 disposed in the rear of the headset 100. In the illustrated example, the ninth and tenth tension straps 338, 340 are operatively coupled to the first strip 304 and/or the headband 316, slidably coupled to a fifth one of the electrode units 321 on each of the second, third and fourth strips 306, 308, 310, slidably coupled to a second one of the electrodes 321 on the fifth strip 312 and are operatively coupled to the adjustor 358 disposed in the rear of the headset 100. Also in the illustrated example, additional tension straps 342-356 are operatively coupled to the first strip 304 and/or the headband 316, additional ones of the plurality of electrode units 321 on the second, third, fourth and fifth strips 306, 308, 310, 312 and the adjustor 358 disposed in the rear of the headset 100. In other examples, the tension straps 322-356 may be arranged differently and may be operatively coupled and/or slidably coupled to different ones of the plurality of electrode units 320, 321 on different ones of the strips 304-312. Also, in some examples a single tension strap may be coupled to the respective electrode units 320, 321 such as, for example, along the center of the electrode units 321 between the front of the head and the adjustor 358.

In an example operation, the headband 316 is stretched over the head of a person and the electrode assembly 302 is placed on top of the head. FIGS. 3A and 3B illustrate the example headset 300 in an adjustment state, where strips 302-312 are being placed over the head of the person. The adjustor 358 is then connected to the base 318. In the illustrated example, the adjustor 358 comprises a wheel. As the wheel is rotated, the tensions straps 322-356 are wound around the wheel and, thus, the effective lengths of the tension straps 322-356 are shortened and the tension in the tension straps 322-356 pulls the strips 304-312 of the electrode assembly 302 against the head of the user. To loosen the headset 300, the adjustor 358 is rotated in the opposite direction. FIG. 3C illustrates the example headset 300 as it is being adjusted to move the strips 302-312 closer to the head of the person.

FIGS. 5A-5D are enlarged views of an example assembly of one of the electrode units 321 (shown on the headset 300 of FIGS. 3A-4). Specifically, FIG. 5A shows an example electrode unit 321. The example electrode unit of FIG. 5A may represent any of the electrode units 321 of the headset 300. The example electrode unit 321 includes an electrode housing 502 that is coupled to a FPCB 504. The FPCB 504 is disposed within the shell or body of the example strips 304-312. The housing 502 of the illustrated example includes two electrode openings 506, 508, to receive electrodes, and two peg openings 510, 512, which receive pegs from a bottom side of base (discussed in further detail below).

FIG. 5B shows the electrode unit 321 with a casing or body 514 that covers the FPCB 504. The body 514 may be, for example, one of the strips 304-312. In some examples, the body 514 is molded over the FPCB 504. FIG. 5C shows a first electrode 516 and a second electrode 518 disposed in the respective first and second electrode openings 506, 508 of FIG. 5A. The first and second electrodes 516, 518 are communicatively coupled to the FPCB 504. In some examples, the first and second electrodes 516, 518 are secured in the respective first and second electrode openings 506, 508 via friction fit. In other examples, other suitable fastening techniques may be employed. Also, in some examples, the electrodes 516, 518 are removably coupled to the housing 502. In such examples, a damaged or otherwise inoperable electrode may be easily replaced. In the illustrated example, the electrode unit 321 includes two electrodes. However, in other examples, the electrode unit 321 includes more or fewer than two electrodes. In some examples, each of the electrode units 321 include the same amount of electrodes. In other examples, the amount of electrodes per electrode unit is different.

FIG. 5D shows an example base 520 disposed on top of the housing 502 of FIG. 5A. The base 520 of the illustrated example is a circular disk with two pegs protruding from the bottom of the base 520 that mate with the first and second peg openings 510, 512. The example base 520 also includes two holes 522, 524 where the respective first and second electrodes 516, 518 are received. In the example of FIG. 5D, the first and second electrodes 516, 518 extend through the respective first and second holes 522, 524. As shown in FIG. 5D, the base 520 also includes two apertures 526, 528 to receive tension straps (e.g., the tension straps 322-356). The apertures 526, 528 of the illustrated example extend from a first end of the base 520 to the opposite end of the base 520. As the tension straps are tightened, the electrode unit 320 is pulled closer to the head of the user to enable the electrodes 516, 518 to engage the scalp.

In the example headset 300 of FIGS. 3A-5D, the apertures 526, 528, which are to receive the tension straps 322-356, are positioned substantially orthogonal to longitudinal axes of the strips 304-312. In the example headset 100 of FIGS. 1A-2C, the apertures or channels 208, 210 are positioned substantially parallel to or along the longitudinal axes of the strips 106-114.

FIG. 6 is an exploded view of an example assembly of one of the electrode units 320 of the first strip 304 of the headset 300. The example electrode unit 320 of FIG. 6 may represent any of the electrode units 320 of the headset 300. The first strip 304 of this example is to be disposed on the forehead of the user and uses flat electrodes to engage the forehead of the user, rather than a pointed or pin electrode, which are used to penetrate through hair. The forehead generally lacks hair and, thus, flat electrodes may be used to receive signals from the front part of the head more comfortably than pointed electrodes.

In some examples, the electrode units 320, which include relatively flatter electrodes, are used as ground electrodes. In some known systems, a ground electrode is attached to a place on the user's body using a gel, which reduces the amount of impedance. In these known systems, the forehead is typically avoided, because undesired signals (e.g., from eye movement) and other brain signals may be detected at the forehead and, therefore, would be difficult to implement as a ground signal. However, the forehead contains relatively lower impedance than other places on the body. Therefore, the example headset 300 disposes dry electrodes, which are easier and cleaner to use, on the forehead of the user as ground electrodes. To avoid problems of undesired signals in the ground signals detected by the forehead electrodes, the difference between a reference signal and a data signal (e.g., gathered by an electrode on the head of the user, by an electrode of one of the electrode units 321) is subtracted from the difference between the ground signal and the data signal. Thus, the ground signals, including any detected undesired signals, are cancelled out, or eliminated, and the remaining difference is the difference between the data signal and the reference electrode (e.g., known as “referencing”). The reference electrode may be attached, for example, to an earlobe or a nose of the user. An example clip that may be utilized to attach a reference electrode to a user's earlobe is disclosed in U.S. patent application Ser. No. 13/829,849 titled “METHODS AND APPARATUS TO GATHER AND ANALYZE ELECTROENCEPHALOGRAPHIC DATA,” filed Mar. 14, 2013, which is incorporated herein by reference in its entirety. Additionally or alternatively, the ground or reference electrode may be disposed on the neck of the person. An example patch electrode 360 is shown in FIG. 3B attached to the neck of the person. A wire or lead may be connected to the electrode 360 and connected to the processing unit 315.

In the illustrated example of FIG. 6, the electrode unit 320 includes a housing 602, which is similar to the housing 502 shown in FIGS. 5A-5D above. The housing 602 of the illustrated example includes a first electrode opening 604, a second electrode slot 606, a first peg hole 608 and a second peg hole 610. In the example of FIG. 6, a base 612 is couplable to the housing 602. The base 612 includes two pegs on the bottom to engage the peg holes 608, 610. A first electrode 614 and a second electrode 616 are shown in the example of FIG. 6. The first electrode 614 includes a first contact 618 and a first electrode peg 620 and the second electrode 616 includes a second contact 622 and a second electrode peg 624. The first contact 618 of the illustrated example sits within a first cavity 626 in the base 612, and the first electrode peg 620 extends through a first electrode peg hole 628 in the base 612 to engage the first electrode opening 604. Likewise, the second contact 622 sits within a second cavity 630 in the base 612, and the second electrode peg 624 extends through a second electrode peg hole 632 in the base 612 to engage the second electrode opening 606. Signals received by the first and second contacts 618, 622 are transmitted through the respective first and second electrode pegs 620, 624 to the FPCB 504 (which is disposed within the body of the strip 304). In some examples, the electrode unit 320 may be used on any one of the second, third, fourth and fifth strips 306-312 and may include apertures to accommodate tension straps. In some examples, the electrode unit 321 of FIGS. 5A-5C may be used on the first strip 304.

FIGS. 7A-7C illustrate an example electrode 700 that may be used, for example, with the example headset 100 (e.g., to implement the electrodes 212, 214, 216 shown in FIGS. 2A-2C) and/or the example headset 300 (e.g., to implement the electrodes 516, 518 shown in FIGS. 5C-5D) described above. As shown in the example in FIGS. 7A-C, the example electrode 700 includes a pin 702 and a body 704 (e.g., a sheath, a tube, a cover, a housing, etc.). In the illustrated example, the pin 702 and the body 704 are cylindrical and have circular cross-sections. However, in other examples, the electrode pin 702 and/or the body 704 may have a rectangular, square or otherwise shaped cross-section. In the illustrated example, an end 706 of the pin 702 is flat, which provides a larger surface area to contact the scalp of the user. The larger surface area also increases the comfort level of the pin 702 on the head by spacing the applied force across a larger area. However, in other examples, the end 706 of the pin 702 may be rounded, hooked shaped, ring shaped, or otherwise shaped.

FIGS. 7B and 7C are cross-sectional views of the electrode 700. As shown, the pin 702 has a diameter d₁. In some examples, d₁ is about (e.g., within +/−0.04 millimeters) 0.80 millimeters. In other examples, the pin 702 may have a smaller or larger diameter. The electrode pins are sized to protrude through the hair of a user, but also provide sufficient surface area to contact the scalp of the user and receive signals from the brain. In some examples, the electrode 700 is made of a metallic material and/or coated (e.g., anodized or plated) with a metallic material (e.g., silver, gold, etc.). In some examples, if the coating is too thin, the electrode will not be able to effectively detect the ion flow. Therefore, in some examples, the pin 702 is coated with a metallic material greater than about (e.g., within +/−0.1 microns) 5 microns thick. In other examples, the coating may have a larger thickness (e.g., about 80 microns).

In the illustrated example shown, the body 704 has a diameter d₂. In some examples, d₂ is about (e.g., +/−0.5 millimeters) 2 millimeters. In the illustrated example, the electrode 700 has an overall length of l₁ and the body 704 has a length of l₂. In some examples, l₁ is about (e.g., +/−0.5 millimeters) 11.2 millimeters and l₂ is about (e.g., +/−1.0 millimeters) 7.4 millimeters, such that the pin 702 is about (e.g., +/−1.0 millimeters) 3.8 millimeters. However, in other examples, the dimensions d₁, d₂, l₁, l₂ may have other suitable values.

In the example shown in FIG. 7B, the electrode 700 comprises a pogo pin that includes a coil spring 708. The spring 708 of the illustrated example provides a biasing force to extend the pin 702 outward from the body 704 and against the scalp of the user. Different size springs may be utilized with the electrode 700 to provide more or less force. In some examples, the springs or biasing members provide around 2 Newtons of force.

In the example shown in FIG. 7C, the electrode 700 comprises a leaf spring 710. The leaf spring 710 provides a biasing force to extend the pin 702 outward from the body 704 and against the scalp of the user. Different strength leaf springs may be utilized with the electrode 700 to provide more or less force.

FIG. 8A shows an example processing unit 800 (e.g., a computer module, an electronics module) that may be used with any of the example headsets 100, 300 described above. The example processing unit may be, for example, the processing unit 170 of the headset 100 or the processing unit 315 of the headset 300. The processing unit 800 is described herein in combination with the headset 100. However, it is to be understood that the processing unit 800 may similarly be unitized with the headset 300 and/or any other headset.

The processing unit 800 may be removably coupled to a headset such as, for example, the headset 100 described above (e.g., see FIGS. 1A-1E). The processing unit 800 of the illustrated example includes electronic components for receiving, storing and/or processing the EEG signals gathered by electrodes (e.g., from the electrode units 117 of the strips 106-114). The processing unit 800, which includes many electronic components, may be removed from the electrode assembly 102 so that the electrode assembly 102 and adjustment assembly 104 can be cleaned (e.g., sterilized, washed, disinfected) without harming the electronic components of the processing unit 800. For example, the electrode assembly 102 may be used multiple times and by multiple users and cleaning the electrode assembly 102 and adjustment assembly 104 reduces (e.g., minimizes) the risk of transferring bacteria, viruses, infections, etc. Additionally, if the electrode assembly breaks or becomes otherwise inoperable (e.g., when a number of electrodes malfunction), the processing unit 800 may be disconnected and attached to a new electrode assembly and, thus, reduces (e.g., minimizes) the cost of replacing the headset. The same processing unit can be easily disconnected from one electrode assembly (e.g., in a first size) and attached to another electrode assembly (e.g., in a second size). Further, the processing unit may be easily disconnected from the electrode assembly 102 and plugged into a computer to download and/or analyze the data stored in the processing unit 800.

As shown in FIG. 8A, the processing unit 800 of the illustrated example is defined by a housing 802 (e.g., a shell, a casing, a cover, a protective surface, etc.), which includes a top cover 804 and a bottom plate 806 that are operatively coupled together (e.g., via screws, adhesives, a snap fit and/or any other suitable mechanical or chemical fastener) to form the housing 802. In the illustrated example, the processing unit 800 is rectangular shaped and has a bend or arc formed in the middle. The arc shaped housing 802 allows the processing unit 800 to remain close to the top of the head of a subject when connected to the electrode assembly 102. However, in other examples, the housing 802 of the processing unit may be other shapes.

The bottom plate 806 of the processing unit 800 of the illustrated example has an opening 808 that exposes a connection hub 810. The connection hub 810 includes electrical connectors that are communicatively coupled to the electronic circuitry contained within the housing 802. Specifically, the connection hub 810 has a first electrical connector 812, a second electrical connector 814 and third electrical connector 816 coupled to a circuit board 818 disposed within the housing 802. In the illustrated example, the first and second electrical connectors 812, 814 are forty-pin connectors (e.g., board-to-board connectors, mezzanine connectors, edge type connectors, ribbon connectors, high density precise connectors, etc.). However, in other examples, the first and second electrical connectors 812, 814 may be any other type(s) and/or number of connectors suitable to transmit electrical signals. The first and second connectors 812, 814 are used to connect to the electrode assembly 102 and receive signals from the electrodes (e.g., from the electrode units 117). In the illustrated example, the first and second connectors 812, 814 each have forty (40) pins, which correspond to forty signals or channels (e.g., one for each electrode). Thus, a total of eighty (80) signals can be transmitted at one time. However, in other examples, other types of connectors having a different amount of pins may be used.

The third connector 816 of the illustrated example is a universal serial bus (USB) type connector and is used for charging the battery and updating firmware and/or software. The third connector 816 of the illustrate example may be connected to an outside computer or processing station and new software may be uploaded to the processing unit 800.

In the example of FIGS. 8A-8B, the connection hub 810 is located substantially in the middle of the housing 802 and centered at the bend. However, in other examples, the connection hub 810 and the first, second and third electrical connectors 812-816 may be located elsewhere on the housing 802. An enlarged view of the connection hub 810 is shown in FIG. 8B, where the bottom plate 806 is shown in dashed lines to expose the interior of the processing unit 800.

As shown in FIG. 8A, the bottom plate 806 of the housing 802 of the example includes a door 820 near one end of the housing 802. The door 820 opens to expose the interior of the processing unit 800. For illustrative purposes, the door 820 is shown in an open position. The processing unit 800 includes a semiconductor based processor 822 (e.g., a microprocessor) and a battery 824 (e.g., a battery pack, a lithium battery, etc.). A portion of the processor 822 and a portion of the battery 824 are shown in FIG. 8B. The processor 822 of the illustrated example is disposed in one side of the housing 802 and the battery 824 is disposed in the other side of the housing 802. The battery 824 is accessed through the door 820. In other words, the door 820 opens to allow the battery 824 to be removed or connected. The battery 824 may be removed, charged and replaced, or the battery 824 may be charged by plugging the third electrical connector 816 into a power source.

FIG. 9A shows an example connection port 900 operatively coupled to the central strip 116 of the electrode assembly 102 to provide a junction where the processing unit 800 may be removably coupled to the electrode assembly 102. FIG. 9B is an enlarged view of the connection port 900. As described above, the electrode assembly 102 of the illustrated example includes the first strip 106, the second strip 108, the third strip 110, the fourth strip 112 and the fifth strip 114 operatively coupled to the central strip 116. Each of the strips 106-114 includes a plurality of electrode units 117 to gather EEG signals along the scalp of a user.

The connection port 900 includes a cup 902 (e.g., having an annular rim), a fourth connector 904 and a fifth connector 906. The cup 902 corresponds substantially to the shape of the opening 808 formed in the bottom plate 806 of the processing unit 800, such that the connection hub 810 can slidably receive the cup 902 of the connection port 900. When the processing unit 800 is be coupled to the electrode assembly 102, the cup 902 is inserted in the opening 808 of the processing unit, the first connector 812 of the processing unit 800 mates with the fourth connector 904 and the second connector 814 of the processing unit 800 mates with the fifth connector 906.

As shown in the example of FIG. 9B, the connection port 900 includes a first retainer ring 908 and a second retainer ring 910 (e.g., o-rings) that are disposed around an outside surface of the cup 902. When the connection port 900 is inserted into the opening 808 of the connection hub 810 on the processing unit 800, the first and second retainer rings 908, 910 create friction between the outer surface of the cup 902 and the opening 808 of the processing unit 800 to help secure the processing unit 800 on the central strip 116.

As mentioned above, the electrode assembly 102 and adjustment assembly 104 of the illustrated example may be detached from the processing unit (e.g., the processing unit 170, the processing unit 800) and washed or cleaned to sterilize and/or sanitize the electrode assembly 102 and adjustment assembly 104. In some examples, a cap may be used to cover the connection portion 900 to prevent water and/or other wash solutions from seeping into the electrical connectors in the connection portion 900.

FIG. 9C shows the fourth connector 904 and the fifth connector 906 coupled to the FPCB 232, which is disposed within the electrode assembly 102 of the illustrated example. The outer surfaces of the electrode assembly 102 of this example have been removed to show the FPCB 232. The connection port 900 is shown in dashed lines to expose the fourth connector 904 and the fifth connector 906. As shown, the FPCB 232 traverses through the electrode assembly 102 and couples the electrode units 117 to the connection port 900. The FPCB 232 of the illustrated example transfers the EEG signals from the electrode units 117 to the pins of the fourth and fifth connectors 904, 906 of connection port 900, thus allowing the fourth and fifth connectors 904, 906 to transfer the signals to the processing unit 800. In other examples, the FPCB 232 may be any communication link including wires or a ribbon connector to transfer the signals from the electrode units 117 through the electrode assembly 102 to the connection port 900.

FIG. 10A is an exploded view of an example cup 1000 that may be used in place of the cup 902 of FIGS. 9A-9C. FIG. 10B is an assembled view of the example cup 1000. The example cup 1000 provides extra strength relative to the cup of 902 of FIGS. 9A-9C and assists in securing the portion of the central strip 116 and PCB 232 around the connection hub 900 to prevent the FPCB 232 from bending too much and potentially detaching from the fourth and fifth connectors 904, 906. The example cup 1000 of FIGS. 10A and 10B includes a top portion 1002, a bottom portion 1004, and a clip 1006. The top and bottom portions 1002, 1004 are operatively coupled together on the top and bottom of the central support strip 116. The clip 1006 attaches to the bottom of the bottom portion 1004 and further prevents the top and bottom portions 1002, 1004 from bending.

As shown in FIGS. 10A and 10B, the top portion 1002 of this example has an opening 1008 to receive the fourth and fifth connectors 904, 906. The top portion 1002 also includes a first annular groove 1010 and a second annular groove 1012, which may be used, for example, to receive retainer rings (e.g., retainer rings 908, 910).

FIG. 11A illustrates the example processing unit 800 coupled to the electrode assembly 102 of the example headset 100 of FIGS. 1A-1E. In this illustrated example, the shell of the electrode assembly 102 is shown in dashed lines to expose the FPCB 232, and the housing 802 of the processing unit 800 is also shown in dashed lines to expose the internal components (e.g., the circuit board 818, the processor 822, the battery 824) of the processing unit 800. When coupled to the electrode assembly 102, the two ends of the processing unit 800 are curved or angled downwards. This allows the processing unit 800 to remain close to the head of a user and reduce the risk of the processing unit 800 getting snagged or caught on foreign objects and to provide greater stability for the headset 100. The PCB 232 of the illustrated example transfers the signals gathered by the electrode units 117 from the first, second, third, fourth and fifth strips 106-114 to the processing unit 800 to be processed. In the example of FIG. 11A, one side of the processing unit 170 includes the processor 822 and the other side the processing unit 800 includes the battery 824. The processor 822 and the battery 824 are operatively coupled to the circuit board 818 inside the housing 802.

FIG. 11B is a cross-sectional view of the headset 100 taken along line A-A of FIG. 11A through the PCB 232. The shell of the electrode assembly 102 and the housing 802 of the processing unit 800 are shown in dashed lines to expose the PCB 232 and the inner components (e.g., the circuit board 818, the processor 822, the battery 824) of the processing unit 800. The first connector 812 is connected to the fourth connector 904 and the second connector 814 is connected to the fifth connector 906.

FIG. 11C is a cross-sectional view of the example headset 100 taken along line B-B of FIG. 11A through the processing unit 800. As shown, the first connector 812 of the processing unit 800 couples to the fourth connector 904 of the connection port 900 and the second connector 814 of the processing unit 800 couples to the fifth connector 906 of the connection port 900. In this example, the first, second, fourth and fifth connectors 812, 814, 904, 906 are forty-pin interlocking connectors. The pins of the first, second, fourth and fifth connectors 812, 814, 904, 906 are communicatively coupled to transfer electrical signals therebetween.

FIG. 12 is a block diagram of an example processing system 1200 for use with the example headset 100 and/or the example headset 300. The example system 1200 includes a plurality of electrodes 1202 such as, for example, the electrodes (e.g., the electrodes 212, 214, 216, 516, 518, 614, 616) in the electrode units 117 of the example headset 100 or the electrodes in the electrode units 320, 321 of the example headset 300. The electrodes 1202 are coupled, for example, to a headset to be worn on a head of a subject, such as, for example, in the example headset 100 or the example headset 300 disclosed above.

The electrodes 1202 are also communicatively coupled to a processing unit 1204 (e.g., the processing unit 170 of the headset 100 shown in FIGS. 1A-1E, the processing unit 315 of the headset 300 shown in FIGS. 3A-3C and/or the processing unit 800 shown in FIGS. 8A, 8B and 11A-C) via a communication link 1206, which may be for example a wired or wireless communication link including, for example, the FPCB 232 disclosed above. The communication link 1206 may be, for example, incorporated in the strips 106-114 and/or the central support member 116 of the headset 100 or in the strips 304-312 and/or the central support member 314 of the headset 300.

The electrodes 1202 are coupled to adjustor(s) 1201. The adjustors 1201 adjust the position of the electrodes 1202 relative to the head of the subject and/or relative to other ones of the electrodes 1202. Example adjustors 1201 include the example adjustors 142-152 disclosed above in connection with the headset 100, which are operatively coupled to the example electrodes (e.g., in the example units 117) via the example strips 106-114 and the example tension straps 118-136. An example adjustor 1201 also includes the example adjustor 358 disclosed above in connection with the headset 300, which is operatively coupled to the example electrodes (e.g., in the example units 320, 321) via the example strips 304-312 and the example tension straps 322-356. In addition, as disclosed above, in some examples, the adjustors 1201 are rotatable wheels, and in some examples, the adjustors 1201 are automatically operate using, for example, one or more motor(s) 1203.

The example processing unit 1204 includes an analog-to-digital converter 1208, a signal conditioner 1210, a database 1212, an analyzer 1214 and a transmitter 1216. In the example headset 100 disclosed above, the analog-to-digital converter 1208, the signal conditioner 1210, the database 1212, the analyzer 1214 and/or the transmitter 1216 may be incorporated into the processing unit 170. In the example headset 300 disclosed above, the analog-to-digital converter 1208, the signal conditioner 1210, the database 1212, the analyzer 1214 and/or the transmitter 1216 may be incorporated into the processing unit 315. Additionally and or alternatively, the analog-to-digital converter 1208, the signal conditioner 1210, the database 1212, the analyzer 1214 and/or the transmitter 1216 may be incorporated into the processor 822 of the processing unit 800, which may be used with the example headsets 100 and/or 300. In other examples, analog-to-digital conversion, signal conditioning, analysis and transmission may occur closer to the source such as, for example in the housings 202, 502, contact member 206 and/or base 520.

The analog-to-digital converter 1208 converts the analog signals received at the electrodes 1202 to digital signals. In some examples, the analog-to-digital converter 1208 is located in the processing unit 1204 in the housing of the headset. In other examples, the analog-to-digital converter 1208 comprises multiple A-D converters located to service individual or sets of the electrodes to convert the signals as close to the source as possible, which may further reduce interference. In some examples, the A-D converters are disposed within housings of electrode units that each have one or more electrodes (e.g., the electrode unit 117).

The signal conditioner 1210 of the illustrated example prepares the gathered signals so that the data is in a more usable form. For example, the signal conditioner 1210 may include an amplifier to amplify the signal to a more detectable level. In addition, the signal conditioner 1210 may include a filter to remove noise from the signal. The filter may also be used as a bandpass filter to pass one or more frequency bands and/or manipulate select bands depending on the desired processing and/or analysis. In some examples, each of the electrodes 1202 may include a signal conditioner at or near the electrode 1202. The example signal conditioner 1210 may include hardware and/or software to execute a signal conditioning method. In some examples, the signal conditioner includes a detrending unit to compensate for electrode polarization, in which there is slow movement of the voltage signal unrelated to brain wave activity due to polarization of the electrodes. The example processing unit 1204 also provides signal processing that may include hardware and/or software to execute Fast Fourier Transform (FFT) calculations, coherence measurements and/or custom adaptive filtering.

The analyzer 1214 is to analyze the data gathered from the electrodes 1202 and processed by the analog-to-digital converter 1208 and the signal conditioner 1210 in accordance with one or more analysis protocols depending on the desired study. For example, in accordance with some studies, the analyzer 1214 may process the data to determine one or more of a subject's mental state, physiological state, attention, resonance or memory, emotional engagement and/or other suitable characteristics of the subject.

The transmitter 1216 communicates the data at any stage of processing and/or the results of the analysis from the analyzer 1214 to an output 1218. The output 1218 could be a handheld device, an alarm, a display screen on the headset, a remote server, a remote computer and/or any other suitable output. Data transmission may be implemented by Bluetooth transmission, wi-fi transmission, ZiGBee transmission and/or encryption before transmission. In the illustrated example, the database 1212 stores all data gathered streams. The streams can be buffered for streaming or stored on-board (i.e., at the headset) for periodic or aperiodic uploads during, for example, low-activity periods.

The processing unit 1204 components 1208-1216 are communicatively coupled to other components of the example system 1200 via communication links 1220. The communication links 1220 may be any type of wired connection (e.g., a databus, a USB connection, etc.) or a wireless communication mechanism (e.g., radio frequency, infrared, etc.) using any past, present or future communication protocol (e.g., Bluetooth, USB 2.0, USB 3.0, etc.). Also, the components of the example system 1200 may be integrated in one device or distributed over two or more devices.

While an example manner of implementing the system 1200 is illustrated in FIG. 12, one or more of the elements, processes and/or devices illustrated in FIG. 12 may be combined, divided, re-arranged, omitted, eliminated and/or implemented in any other way. Further, the example processing unit 1204, the example signal conditioner 1210, the example A/D converter 1208, the example database 1212, the example transmitter 1216, the example analyzer 1214, the example output 1218 and/or, more generally, the example system 1200 of FIG. 12 may be implemented by hardware, software, firmware and/or any combination of hardware, software and/or firmware. Thus, for example, any of the example processing unit 1204, the example signal conditioner 1210, the example A/D converter 1208, the example database 1212, the example transmitter 1216, the example analyzer 1214, the example output 1218 and/or, more generally, the example system 1200 of FIG. 12 could be implemented by one or more analog or digital circuit(s), logic circuits, programmable processor(s), application specific integrated circuit(s) (ASIC(s)), programmable logic device(s) (PLD(s)) and/or field programmable logic device(s) (FPLD(s)). When reading any of the apparatus or system claims of this patent to cover a purely software and/or firmware implementation, at least one of the example processing unit 1204, the example signal conditioner 1210, the example A/D converter 1208, the example database 1212, the example transmitter 1216, the example analyzer 1214 or the example output 1218 is/are hereby expressly defined to include a tangible computer readable storage device or storage disk such as a memory, a digital versatile disk (DVD), a compact disk (CD), a Blu-ray disk, etc. storing the software and/or firmware. Further still, the example system 1200 of FIG. 12 may include one or more elements, processes and/or devices in addition to, or instead of, those illustrated in FIG. 12, and/or may include more than one of any or all of the illustrated elements, processes and devices.

Flowchart representations of example instructions, at least some of which are machine readable, for implementing the headset 100, the headset 300 and/or system 1200 of FIGS. 1A-12 are shown in FIGS. 13 and 14. In this example, the machine readable instructions comprise a program for execution by a processor such as the processor 1512 shown in the example processing platform 1500 discussed below in connection with FIG. 15. The program may be embodied in software stored on a tangible computer readable medium such as a CD-ROM, a floppy disk, a hard drive, a digital versatile disk (DVD), or a memory associated with the processor 1512, but the entire program and/or parts thereof could alternatively be executed by a device other than the processor 1512 and/or embodied in firmware or dedicated hardware. Further, although the example program is described with reference to the flowcharts illustrated in FIGS. 13 and 14, many other methods of implementing the example headset 100, the example headset 300 and/or example system 1200 may alternatively be used. For example, the order of execution of the blocks may be changed, and/or some of the blocks described may be changed, eliminated, or combined.

As mentioned above, the example process of FIG. 14 and at least a portion of the example process of FIG. 13 may be implemented using coded instructions (e.g., computer and/or machine readable instructions) stored on a tangible computer readable storage medium such as a hard disk drive, a flash memory, a read-only memory (ROM), a compact disk (CD), a digital versatile disk (DVD), a cache, a random-access memory (RAM) and/or any other storage device or storage disk in which information is stored for any duration (e.g., for extended time periods, permanently, for brief instances, for temporarily buffering, and/or for caching of the information). As used herein, the term tangible computer readable storage medium is expressly defined to include any type of computer readable storage device and/or storage disk and to exclude propagating signals and to exclude transmission media. As used herein, “tangible computer readable storage medium” and “tangible machine readable storage medium” are used interchangeably. Additionally or alternatively, the example process of FIG. 14 and at least a portion of the example process of FIG. 13 may be implemented using coded instructions (e.g., computer and/or machine readable instructions) stored on a non-transitory computer and/or machine readable medium such as a hard disk drive, a flash memory, a read-only memory, a compact disk, a digital versatile disk, a cache, a random-access memory and/or any other storage device or storage disk in which information is stored for any duration (e.g., for extended time periods, permanently, for brief instances, for temporarily buffering, and/or for caching of the information). As used herein, the term non-transitory computer readable medium is expressly defined to include any type of computer readable storage device and/or storage disk and to exclude propagating signals and to exclude transmission media. As used herein, when the phrase “at least” is used as the transition term in a preamble of a claim, it is open-ended in the same manner as the term “comprising” is open ended.

FIG. 13 is a flowchart illustrating an example process of gathering EEG data (block 1300) that may be implemented, for example, with the example headset 100 and/or the example headset 300 disclosed herein. The example process includes placing an adjustment assembly on a head of a person (block 1302) such as, for example, the adjustment assembly 104 shown in FIGS. 1A-1E, which includes the first support 138, the second support 140, the rear support 154, the front support 156 and/or the first and second adjustment lines 158, 160. The example adjustment assembly 104 of FIGS. 1A-1E includes rubber, nylon and/or silicone components that may be stretched over the head of the person. In some examples, the adjustment assembly 104 includes the first and/or second adjustment lines 158, 160 that couple the first and second supports 138, 140, the rear support 154 and the front support 156 together. The first and second adjustment lines 158, 160 may include nylon and may stretch as the user puts the adjustment assembly on his/her head. In some examples, the first support 138 is to be disposed on the right side of the head, the second support 140 is to be disposed on the left side of the head, the rear support 154 is to be disposed on the back side of the head (e.g., below the occipital bone) and the front support 156 is to be disposed on the front of the head (e.g., on the forehead).

The adjustment assembly (block 1302) may also include, for example, the headband 316 of the headset 300 shown in FIGS. 3A-3C. The headset 300 of FIGS. 3A-3C includes an electrode assembly 302 having electrodes strips 304-312. The first electrode strip 304 is operatively coupled to the headband 316 (e.g., via the first and second tension straps 322, 324). In use, the headband 316 is stretched onto the head of a person such that the electrode assembly 302 is disposed on the top of the head of the person.

The example process 1300 includes attaching one or more strip(s) to one or more adjustor(s) (block 1304). In some examples, the strips include a plurality of electrodes and at least one tension strap that is attachable to the adjustor(s). In some examples, one or more of the strips includes two tension straps that are disposed along the electrode side of the respective strip. In other examples, multiple tensions straps are coupled to each of the strips (e.g., the example arrangement shown in FIGS. 3A-3C). In some examples, the ends of the strips are attached to a separate adjustor (e.g., via the tension straps). In other examples, two or more strips are coupled to the same adjustor.

For example, the example headset 100 of FIGS. 1A-1E includes the plurality of attachable/detachable strips 106-114 of the electrode assembly 102. The example strips 106-114 are attached to the respective adjustors 142-152 and are disposed over the head of a person. Additionally or alternatively, the example headset 300 disclosed above also includes a plurality of attachable/detachable strips 304-312 that are attached to an adjustor 358.

The example process 1300 includes attaching the adjustor(s) to the adjustment assembly (block 1306). In some examples, each of the adjustors is removably attached to the adjustment assembly. The adjustors are attached to the adjustment assembly such that the strips are disposed over the head of the user from the left side of the head to the right side of the head. The adjustors are operable to move the strips and pull the strips and their respective electrodes closer to the scalp of the user. In the example headset 100 of FIGS. 1A-1E, the first, second and third attachment devices 142, 144, 146 are attached to the first support 138 on a first side of the head, and the fourth, fifth and sixth attachment devices 148, 150, 152 are attached to the second support 140 on a second side of the head. In the example headset 300 of FIGS. 3A-3C, the adjustor 358 is coupled to the base 318 in the rear of the headset 300.

The example process 1300 includes adjusting the adjustors and rear adjustors (block 1308). The adjustors operate to move the respective strips relative to the head. As disclosed above, in some examples, the strips include one or more tension straps that are slidably connected to the strips. The tension straps are coupled to the adjustors, and the adjustors operate to change the tension in the tension straps to move the strips on the head of the user. By increasing tensions in the tension straps, the strips and the respective electrode units are pulled closer to the scalp of the user.

In some examples, the adjustors comprise wheels that are rotatably attached to the adjustment assembly. The tension straps are attached to the wheels such that as a wheel is turned, the effective length of the associated tension strap(s) is changed (e.g., more tension or less tension). In some examples, the adjustors are automatic and may include a motor or be coupled to a motor to adjust the tension in the tension straps.

In some examples, the adjustment assembly also includes one or more rear adjustors to adjust the location of the side supports on the right and left sides of the head. In some examples, a rear support includes a first adjustment line that is connected to the two side supports and a front support. A first rear adjustor operates to move the side supports toward the back of the head and, thus, decrease the distance between the rear support and the two side supports. In some examples, the rear support also includes a second adjustment line that is also coupled to the two side supports and the front support. In this example, the second adjustment line is positioned below the ears to bias the two side supports downward on the head of the user. In some examples, the rear support includes a second rear adjustor to operate/change the tension in the second adjustment line to move the two side supports and, thus, the adjustors and the respective strips.

In the example headset 100 of FIGS. 1A-1E, the tension straps 118-136 are attached to the respective adjustors 142-152 on the first and second supports 138, 140. A user may adjust one or more of the adjustors 142-152 (block 1308) to change the tension in one or more of the tension elements 118-136 to move one or more of the respective strips 106-114 and tighten one or more of the strips 106-114 against the scalp of the user. In the illustrated example of FIGS. 1A-1E, the adjustment assembly 104 also includes the first and second adjustment lines 158, 160 that are slidably received by the rear support 154 and coupled to the first and second supports 138, 140 and the front support 156. In some examples, the first rear adjustor 162 is adjusted (block 1308) to change the tension in the first adjustment line 158 and, thus, move the first and second supports 138, 140. In some examples, the rear support 154 also includes the second rear adjustor 164 that is adjusted (block 1308) to change the tension in the second adjustment line 160. The example rear support 154 includes guides 166, 168 (e.g., a third support and a fourth support) to direct the second adjustment line 160 below the ears of the user and below the first and second supports 138, 140, such that changing the tension of the second adjustment line 160 moves the first and second supports 138, 140 downward on the head.

Additionally or alternatively, in the example headset 300 of FIGS. 3A-3C, each of the tension straps 322-356 is operatively connected to the first strip 304 and/or the headband 316 on one end and to the adjustor 358 on the opposite end. The tensions straps 322-356 are slidably coupled to the respective electrodes units 320, 321, which are operatively coupled to the respective electrode strips 304-312. The adjustor 358 is attached to the base and a user may adjust the adjustor 358 (block 1308) to change the tension in the tension straps 322-356 to move the strips 304-312 toward the scalp of the user.

In addition, the example process 1300 includes gathering signals from the electrodes of the headset (block 1310). The signals may be monitored, analyzed, manipulated, etc. In the example headsets 100, 300 of FIGS. 1A-1E and 3A-3C, the signals from the electrode units 117, 320, 321 are transferred to the processing unit 170, 315 where at least some of the conditioning and/or processing may occur. Additionally, example processing unit 800 may be used with the example headsets 100, 300 to gather/receive signals from the respective electrodes.

The example process 1300 also includes determining if the headset requires further adjusting (block 1312). In some examples, the adjustors and/or the rear adjustors operate to move the electrode assembly on the head of the user and increase the pressure of the electrodes on the head of the user. If further adjusting is desired (e.g., if the signals are weak and/or the subject is experiencing discomfort), the adjustors and/or the rear adjustors can be further adjusted (block 1308). With the headset adjusted, the example process 1300 gathers signals from the electrodes (block 1310). If further adjustment is not needed (block 1312) and the monitoring is complete, the example process 1300 ends (block 1314).

FIG. 14 is a flowchart representative of example instructions which may be executed to analyze EEG data (block 1400) collected from the example headset 100 of FIGS. 1A-1E and/or the example headset 300 of FIGS. 3A-3C. For example, the example headset 100 has a plurality of electrodes that contact the scalp of a subject to receive electrical signals from the subject's brain. The example process of analyzing EEG data (block 1400) includes reading the EEG signals from the electrodes (block 1402). In the illustrated example, the signals are converted from an analog signal to a digital signal (block 1404). In some examples, the analog-to-digital conversion takes place in a processing unit, such as, for example, the processing unit 1204 of the example system 1200. In other examples, the analog-to-digital conversion takes place adjacent the electrodes within the headset to convert the signal as close to the source as possible, examples of which are disclosed above.

In the illustrated example, the signals are conditioned (block 1406) to improve the usefulness of the signals and the accessibility of the data contained therein. For example, as disclosed above, the conditioning may include amplifying the signals and/or filtering the signals (e.g., with a bandpass filter).

The signals are analyzed (block 1408) to, for example, determine a mental state of the subject, a health condition, an engagement with media as an audience member or effectiveness of the media, or an input desire for an electrical device. For example, the EEG data may be analyzed to evaluate brain activity in particular frequency bands of the EEG data and/or in particular regions of the brain. Assessments and/or calculations of the relationship(s) and correlation(s) of the frequency bands and regions of activity of the EEG data may be used to determine an emotional or mental state of a person including, for example, attention, emotional engagement, memory or resonance, etc. A description of other processing operations and techniques is disclosed in U.S. patent application Ser. No. 13/829,849 titled “METHODS AND APPARATUS TO GATHER AND ANALYZE ELECTROENCEPHALOGRAPHIC DATA,” filed Mar. 14, 2013, which is incorporated herein by reference in its entirety.

In the illustrated example, the signals (e.g., the results of the analysis) are transmitted to an output (block 1410), such as, for example, the output 1218 of the example system 1200. Example modes of output are include, for example, sounding an alarm, displaying a message and/or other alert on a screen, issuing a report to a local and/or remote computer and/or any other suitable output. In addition, the output may include the wired or wireless communications detailed herein. In some examples, the output includes data reflected of a person paying attention, the person not paying attention, the person in a state of semi-involvement with a media program, or other mental state of the person, and the identity of the program are transmitted to, for example a remote data facility. Raw data, processed data, a history log or an indicator of audience measurement also may be transmitted to the remote data for collection. The remote data facility may be, for example, a marketing company, a broadcast company, an entertainment studio, a television network and/or any other organization that might benefit from or otherwise desire to know when people are and/or are not focused on broadcast programs and what those programs are. This example allows broadcasting companies and/or marketing personnel to analyze which programs people are watching, when they are watching the programs and/or when they are focused during the broadcast. After the output (block 1410), the example process 1400 ends (block 1412).

FIG. 15 is a block diagram of an example processing platform 1500 capable of executing the one or more of the instructions of FIGS. 13 and 14 to implement one or more portions of the apparatus and/or systems of FIGS. 1A-1E, 2A-2C, 3A-3C, 4, 5A-5D, 6, 7A-7C, 8A-8B, 9A-9C, 10A-10B, 11A-11C, and 12. The processing platform 1500 can be, for example, a processor in a headset, a server, a personal computer, a mobile device (e.g., a cell phone, a smart phone, a tablet such as an iPad™), a personal digital assistant (PDA), an Internet appliance and/or any other type of computing device.

The processor platform 1500 of the illustrated example includes a processor 1512. The processor 1512 of the illustrated example is hardware. For example, the processor 1512 can be implemented by one or more integrated circuits, logic circuits, microprocessors or controllers from any desired family or manufacturer.

The processor 1512 of the illustrated example includes a local memory 1513 (e.g., a cache). The processor 1512 of the illustrated example is in communication with a main memory including a volatile memory 1514 and a non-volatile memory 1516 via a bus 1518. The volatile memory 1514 may be implemented by Synchronous Dynamic Random Access Memory (SDRAM), Dynamic Random Access Memory (DRAM), RAMBUS Dynamic Random Access Memory (RDRAM) and/or any other type of random access memory device. The non-volatile memory 1516 may be implemented by flash memory and/or any other desired type of memory device. Access to the main memory 1514, 1516 is controlled by a memory controller.

The processor platform 1500 of the illustrated example also includes an interface circuit 1520. The interface circuit 1520 may be implemented by any type of interface standard, such as an Ethernet interface, a universal serial bus (USB), and/or a PCI express interface.

In the illustrated example, one or more input devices 1522 are connected to the interface circuit 1520. The input device(s) 1522 permit(s) a person to enter data and commands into the processor 1512. The input device(s) can be implemented by, for example, an audio sensor, a microphone, a camera (still or video), a keyboard, a button, a mouse, a touchscreen, a track-pad, a trackball, isopoint and/or a voice recognition system.

One or more output devices 1524 are also connected to the interface circuit 1520 of the illustrated example. The output devices 1524 can be implemented, for example, by display devices (e.g., a light emitting diode (LED), an organic light emitting diode (OLED), a liquid crystal display, a cathode ray tube display (CRT), a touchscreen, a tactile output device and or a light emitting diode (LED). The interface circuit 1520 of the illustrated example, thus, typically includes a graphics driver card, a graphics driver chip or a graphics driver processor.

The interface circuit 1520 of the illustrated example also includes a communication device such as a transmitter, a receiver, a transceiver, a modem and/or network interface card to facilitate exchange of data with external machines (e.g., computing devices of any kind) via a network 1526 (e.g., an Ethernet connection, a digital subscriber line (DSL), a telephone line, coaxial cable, a cellular telephone system, etc.).

The processor platform 1500 of the illustrated example also includes one or more mass storage devices 1528 for storing software and/or data. Examples of such mass storage devices 1528 include floppy disk drives, hard drive disks, compact disk drives, Blu-ray disk drives, RAID systems, and digital versatile disk (DVD) drives.

The coded instructions 1532 of FIGS. 13 and 14 may be stored in the mass storage device 1528, in the volatile memory 1514, in the non-volatile memory 1516, and/or on a removable tangible computer readable storage medium such as a CD or DVD.

Although certain example apparatus have been described herein, the scope of coverage of this patent is not limited thereto. On the contrary, this patent covers all methods, apparatus, and articles of manufacture fairly falling within the scope of the appended claims either literally or under the doctrine of equivalents. 

What is claimed is:
 1. A headset comprising: a first strip to be disposed over a head of a person; and a first electrode unit operatively coupled to the first strip, the first electrode unit including a first housing and a first electrode pin that is retractable into the first housing, the first housing including a first channel to receive a first tension strap.
 2. The headset of claim 1, wherein the first housing includes a second channel to receive a second tension strap.
 3. The headset of claim 2, wherein the first tension strap and the second tension strap traverse along a longitudinal axis of the first strip, and the first channel and the second channel are substantially parallel.
 4. The headset of claim 1, wherein tightening the first tension strap pulls the first electrode unit toward the head of the person, and the first electrode pin retracts into the first housing as the first electrode unit is pulled toward the head of the person.
 5. The headset of claim 4, wherein the first electrode pin is biased against the head of the user.
 6. A headset comprising: a first strip to be disposed over a head of a person; a first electrode unit operatively coupled to the first strip, the first electrode unit including a first housing and a first electrode pin, the first electrode pin being retractable into the first housing; a first tension strap slidably coupled to the first strip; a first support to be disposed on a first side of the head of the person; and a second support to be disposed on a second side of the head of the person, a first end of the first tension strap operatively coupled to the first support and a second end of the first tension strap operatively coupled to the second support.
 7. The headset of claim 6, further including a first adjustor operatively coupled to the first support, the first end of the first tension strap operatively coupled to the first adjustor.
 8. The headset of claim 7, further including a second adjustor operatively coupled to the second support, the second end of the first tension strap operatively coupled to the second adjustor.
 9. The headset of claim 8, further including a second tension strap slidably coupled to the first strip, a first end of the second tension strap operatively coupled to the first adjustor and a second end of the second tension strap operatively coupled to the second adjustor.
 10. The headset of claim 6, further including a third support operatively coupled to the first support and the second support via a second tension strap.
 11. The headset of claim 10, further including a first adjustor operatively coupled to the third support to change a tension of the second tension strap to move the first support and the second support in a first direction.
 12. The headset of claim 11, wherein the first adjustor includes a wheel rotatably coupled to the third support.
 13. The headset of claim 12, wherein rotation of the wheel changes the tension of the second tension strap.
 14. The headset of claim 10, further including a second adjustor operatively coupled to the third support, the third support operatively coupled to the first support and the second support via a third tension strap, the second adjustor to change a tension of the third tension strap to move the first support and the second support in a second direction, different than the first direction.
 15. A method comprising: adjusting a first adjustor to change a first tension in a first tension strap operatively coupled between a first support and a second support, the first support to be disposed on a first side of a head of a person and the second support to be disposed on a second side of the head of the person, the first tension change to cause the first tension strap to slide relative to a first electrode strip including a first electrode pin to thereby cause the first electrode strip to move to adjust a first distance of the first electrode strip relative to the head; and gathering a first set of signals from the head using the first electrode pin.
 16. The method of claim 15, further including adjusting a second adjustor operatively coupled to the second support to change the tension in the first tension strap.
 17. The method of claim 15, wherein the adjusting of the first adjustor changes a second tension in a second tension strap operatively coupled between the first support and the second support, the change to the second tension to cause the second tension strap to slide relative to a second electrode strip including a second electrode pin to thereby cause the second electrode strip to move to adjust a second distance of the second electrode strip relative to the head.
 18. The method of claim 15, further including changing an effective length of the first tension strap by adjusting the first adjustor, wherein the adjusting of the first adjustor includes at least one of: rotating a wheel; actuating an electric motor; or causing the first electrode pin to retract or extend from a first housing operatively coupled to the first electrode strip.
 19. The method of claim 15, further including detaching the first adjustor from the first support to remove the first electrode strip.
 20. The method of claim 15, wherein the first support is to be disposed above right ear of the person and the second support is to be disposed above a let ear of the person, further including adjusting a second adjustor, wherein adjusting the second adjustor changes the position of (1) a third support to be disposed under the right ear of the person and (2) a fourth support to be disposed under the left ear of the person relative to the first support. 